Picky eater tips?

My 12 month old is super picky and eats a handful of things. She mostly throws food on the ground and will either spit out food or will just flat out refuse to it eat it. This is even for foods that we have tried a bunch of times. She seems to have an issue with textures because she still prefers purées. It’s strange because she used to eat real food such as pieces of chicken or rice. Now all of a sudden she hates it. What do I do? Our pediatrician recommended an OT who specializes in food therapy. She’s not concerned since LO is gaining weight but said we could try that. Has anyone done that? Any tips?