@MargaretThursday , thank you so much. I have a 16 year old DD, she has many of the same issues as you. We have also realized there are things that help and those that don't. Most of all, we let her serve herself, as having a full plate also inhibits her appetite (I have a bit of the same thing - I'd rather have two smaller servings than one very big one).
My DH was a fussy eater but now as an adult, he doesn't have texture/food touching issues. My DD, I think, will always have them to some extent. We also tried to do approach her issues in many different ways but in the end, she eats what she eats and when she does. There are foods she will never eat and other she'll sometimes eat heartily and other times not at all. She seems to go off foods quite easily. Since mid-childhood, she's been eating 5 meals a day, all of them pretty small. None of them have ever included a packed lunch! Food touching, temperature issues, texture issues galore in those packed lunches. I'm glad we were never forced to pack her particular lunches for school as she just wouldn't eat them. No reheated foods for her, either (texture).
We also don't have "normal" family meals every night. Unless it's a food she definitely loves, my DH and I will eat the family food and she'll have raw veggies, cheese, bread and cream cheese. I won't lie; her issues have made me question if I am a particularly bad cook, especially if something else is causing me stress. Still, I don't think it's that.
She cooks for herself several times a week, mostly pasta with simple sauces. Despite all these food issues, she's at the 50th percentile now and always has been, so she's getting enough calories.
@Essayer , what you said about family meals looking and feeling different because they are not single ingredients but composed resonated with our experience! We now have no expectations that DD will fully eat family meals, but that she will eat how much and of what she wants while we eat the family meal.
Your DD eats a good variety of foods, it's a good start! I agree with PPs, maybe a referral from the GP to see whether the issue is with texture, appetite or something else, would be worth exploring.