R.J.
I'm not saying this is your daughter... but here is my story:
I've been a competitive athlete my entire life. I was a gymnast (LOVE gymnastics, still do it today, although only floor stuff... but my events were beam and vault)... but I got too tall to stay competitive (rotation). So I got out about a year or two before my friends did (I only did regionals, they did nationals & olympic trials). Most of them "retired" because of stress fractures in their spines, which I missed out on, yay...but ALL of us have stretched our tendons & ligaments to such a degree that without a LOT of muscle tone holding our bones in place, we will dislocate/sprain our ankles & knees fairly easily. Most of our HIPS eve dislocate (from stretching for splits), and that joint is so strong that the femur usually breaks before it will dislocate from the pelvis. <Laughing>... I hadn't known that, and got into a debate with my anatomy and physiology prof, which culminated in a demonstration, that earned me 5 extra credit points on the spot.
Anyhow... all those stretched out joints = pain. I have to be REALLY careful to remain in very very good shape (no running if at all possible, builds up the wrong muscles, and pulls my kneecaps out from where they "belong", which makes each step feel like an icepick), so that my muscles wrap around my joints enough to keep them from hurting AS MUCH, and or dislocation. Which is not as horrifying as it sounds. While certain injuries are synonymous with certain sports (like all girl gymnasts have stretched tendons, or tennis players have the elbow thing, or football players do the neck/shoulder/spine/knee things, soccer players have hip adductor things, swimmers have decreased bone density, whatever...every sport has a price). Of course, so does NOT being active.
From gymnastics I went into swimming, diving, surfing, horseback riding (GREAT for building protective muscles around the knees, btw), ice skating (terrible for your knees...if you have knee problems don't touch this sport with a 10' pole...can you tell the majority of my problems center on my knees?), & the USMC.
Anyhow, most athletes that I've known, including myself, also have high pain tolerance. We just sort of get used to being in pain (and our 4th ventricals...the part in your brain that distributes endorphins and natural pain killers...gets in real good shape). We ignore pain, because we have something fun to do. But in the quiet, the tedium, or while trying to go to sleep... we hurt. We always hurt, but we notice it in quiet spaces. And if we're sick, tired, bored, or have a few injuries we're ignoring... the pain can get almost unbearable. So staying active is key, but too much...argh. It's a fine line to walk.
When I was younger (read under 25), I didn't really know how to express ANY of that... OR to know to "take a break" after a small injury. Nowadays, if I notice something being "off" I chill out for a few days. As a child, I just kept playing. So small injuries would layer themselves on top of small injuries, over and over and over... until I couldn't ignore them anymore. And by the time I couldn't ignore the pain, I was in bad shape. Really really bad shape. For awhile, the only way I slept at night was with morphine or codeine. For a year in HS, I couldn't even walk up the stairs in my own house. I did a half crawl/gimp/lurch thing. (My pride would make me walk up the stairs at school.. or in public... which further compounded problems with my mom. She thought I was just being "overly dramatic" at home...but the truth was, I was just relaxed and unashamed to let my weaknesses show at home.
Like I said though, I not only didn't know how to express that I was in fairly constant pain that I had learned to ignore, didn't know how to voice that something felt "off" so that it was communicated effectively to my mom, didn't know to take a break, and when forced to take a break, didn't take a long enough one to effectively heal.
My mom got so used to my "convenient" excuses... that when I was 14, I actually walked for 2 weeks on a broken ankle, before finally being taken to the doctor. <laughing> That's a hilarious story... but another time.
It wasn't her fault. NONE of what happened between my mother and I was her fault. It was a perfect storm of events. I wasn't communicating effectively, so she had absolutely no trust in me. She also wasn't an athlete, so she wouldn't understand my gimpy attempts to communicate that while I didn't feel up to going to my expensive lesson, I did feel up to going to the beach, or to a friends, or etc etc etc. I was also going through puberty, with all of those joys. :P Or why I flailed up the stairs at home, or walked about like an old man, but put wiggle in my hips and managed stairs "fine" out in public.
By the time I finished HS, there was no trust left between us. None. Zip, nada, zilch. She didn't believe a word I said, about ANYTHING, and there was no reason for me to respect someone who thought I was lying when I wasn't. I left home at 17, by signing up with the military, with the only relationship I had with my mother being one of regret. My father was simply furious with me, for causing my mom so much pain & grief. Oy. When I say I left home at 17, I should add, I was essentially disowned at the same time.
The happy end to this story, is that today my mom and I are best friends. But I had to leave home for years, in order for that to happen. I had to learn to talk, and to trust myself (hard when your own mom doesn't trust you), and she had to stop feeling guilty. I go to extreme effort to avoid making her feel guilty. Like I said, it wasn't her fault.
That lack of trust you're concerned about, you have a right to be afraid of, it's a BIG issue. It could as easily destroy your relationship with your daughter, as it did mine with my mother. I feel incredibly blessed and lucky that we are as close today as we are, and it was pure dumb luck that things worked out the way they did.
It still kills me though. Because the easy fix would have been communication. But I was 11-17, and my communication skills (and self awareness) sucked. And my mom was handicapped by her disbelief, and lack of understanding brought on by my total inability to communicate. We missed out on YEARS together.
Now, like I said, I'm not saying this is what's going on with your daughter. It's just my story.
R