Hi B.~
As a child, (I am 36 now), I had recurrent sore throats/strep year after year after year. My tonsils were the size of large marbles, even when not inflamed, so imagine what they were like inflamed. Unfortunately for me, I grew up during the time period when the doctors were reluctant to remove tonsils, except for the very worst cases - can't even imagine what that had to look like... I was even evaluated by ENT's at Children's Hosp. in Pgh., and still no surgery. Anyhow, after dealing with this for basically my entire youth, finally at age 25, a doctor finally said enough is enough, and removed my tonsils. Well let me tell you, that was the WORST medical experience I have EVER had, and I have a bout with meningitis and a c-section recovery to compare it to...
The recovery from a tonsillectomy at age 25 was harrowing, to say the least. They told me I would need 14 days off from work, and I laughed, thinking I'd be down for a few days, and spend the rest of the time lounging by the pool... as it went, I spent the first 10 of my recovery nights sleeping upright in a recliner, because I felt like my throat was closing, and the mucous build up in my mouth and throat while I healed was so thick and gross, I felt like I was gagging constantly. I couldn't eat - not even broth or popsicles - for a week, it was so painful. Additionally, after the surgery, I had problems with swallowing. I was told that after living for so long with such large tonsils, that they had assumed some of the job of my soft palate, which closes against the back of the throat to keep food/liquids down while swallowing. Well, since my tonsils took up so much space in my throat, my soft palate became sluggish, didn't function properly after the surgery. The result was that frequently when I swallowed, especially liquids but it also happened with food, it would come up into my nose, sometimes even out my nose. Nice, huh? That has since resolved, I assume because my soft palate retrained itself, thank goodness. But it was years before this problem resolved.
I don't mean to scare you - great job, huh? - I am just making a case for having the tonsils removed at a young age because it is well documented that young kids have FAR LESS difficulty with recovery from this surgery. My cousin had the surgery at about your daughters age, and she was up and around in a few days with no residual problems and no significant pain. She spent a few days lounging around eating popsicles and ice cream, and she was fine.
If you have good reason to suspect this may be a lifelong problem for your daughter, and that surgery will be inevitable, I would highly suggest getting the surgery done sooner than later. Don't wait like I did.
Hope this helps. Sorry for being so graphic! :)