OT: 4yo is now picky with food

Grrr frustrating moment the week she turned 4yo, well at 3.5yo her love for her fave foods no longer exist now, how odd that she suddenly has no fave foods and isn't as keen to eat what I used to cook for her. She still dislikes veggies or greens except carrots, beetroot, sometimes potatoes or peas. I've tried cooking different varieties, even when we eat out, pizzas was her thing and now she hardly wants to finish whole slice she once did.