Oh my heart goes out to you! It's such a lonely feeling. My son just didn't eat. He was 9 months old and not eating. I felt like everywhere I looked all I saw was healthy kids who were eating. He didn't even go on the chart. He had his own curve well below the other curve. I was so focused on calories, feedings, etc. I don't remember what his first word was!!!!
I too felt like I lost out. I never got to sit my baby in his high chair and feed him happily. He was never the baby bird who popped his mouth open. I still kinda miss that we didn't get to do that. He was developmentally delayed and it resulted in OT, PT, SLT, feeding clinic, feeding tubes, etc. It was a hard stage in our lives.
Fast forward to today. He is 6 years old and in the 15th percentile. HUGE for a kid who didn't land on the chard. 3 months ago he had his feeding tube removed after having it basically his whole life! He is doing great! Trying new things... now he loves lobster! There is a light at the end of the tunnel.
I mourned for a long time that I didn't get the typical baby. People would say their baby walked at 10 months. Mine walked when he was 3! But, then I learned to appreciate the support we have in our medical community and that w/out it where would he be? I learned that I got my own special journey with him. I remember the first time I ordered him his own happy meal. The first time he ate a hamburger. I almost cried. It was almost worth more than that first word that I can't remember. I was too busy with calories etc. to care what word he said.
It will be okay and maybe when she's 6 she will eat like my son! He still will never be the kid who will eat me out of house and home, but he eats now. There is a light at the end of the tunnel. It can be a long tunnel, but it is there. I used to joke he'd be 40 and still tube fed. I HATED when people would ask when he was going to get it out. I wanted to scream I DON'T KNOW!!!!!!! Now he's doing great!!!!!
Best of luck... feeding issues is something I pray I never have to go through again. You can make it and it WILL get better. It may not feel like it but it will!!