Picky Eater

Y’all I really need some help. My 18 month old is giving me so much trouble when it comes to eating. She likes pouches, breakfast bars, fries, muffins, chicken fries, sometimes will eat pears, yogurt, crackers, and raisins. She used to eat more things but has become a lot more selective. If I try and give her something new she will growl, stick her tongue out or hit me. I don’t want to force her or make her uncomfortable. She drinks whole milk with pediasure, per her pediatricians recommendations. I want to be able to give her a more balanced diet but I am stuck. It may be “normal” but I really need some advice.