Do you have any sense for why she won't eat? Does she show any preference for particular flavours or textures? Is she particularly averse to specific textures, temperatures or flavours? Has she had gastro / intolerances / bad experiences with food? Does she do anything else that concerns you / is unusual?

A pediatric OT and/or speech path may be your best bet for a thorough assessment (will look at sensory issues, chewing and swallowing difficulties, behavioural/emotional causes) and strategies relevant to whatever is driving the issue.