What is what does it mean if a girl shares her food with you?

Sharing food can mean different things depending on the context, the girl's personality, and your relationship with her. Here are a few possible interpretations:

Ultimately, the best way to know what it means is to consider the context of the situation and her overall behavior towards you. Pay attention to other clues, such as her body language, the frequency of her interactions with you, and the general dynamic between you two.