My son was the same, I contacted school and gp asking for any advice to get him assessed for autism/adhd. Gp said he needs to be referred by school, school said he is fine. After asking him nicely for few years I got really angry as I just had my daughter and didn’t want to make 3 different food every day once she starts solids, so my husband took care of our daughter and I sat with our son at the table and said he needs to try the food I made. After begging him for 2 hours I took a bin bag and said that for every 5 minutes he doesn’t try the food I’m binning one of his toys. Well, after 45 minutes he tried (properly, not only a lick and spit out) and he loved it. It’s very drastic and if you’re willing to do that ( I was struggling a lot so be prepared I was ready to give up after 15 minutes) I would rather wait for your daughter to be assessed by a professional to exclude any underlying problem.
Following , I have No advice just have the same issue with my son who’s 7 , he has pasta, brioche, pizza with ketchup and that’s it! Will sometimes eat broccoli but nothing else 🙈 I’m hoping he’ll grow out of it …