Start her off on very bland food, as anything a bit richer could upset her tummy again and it will feel a bit delicate for her anyway after all the vomiting kwim? Don't force her to eat, as she might still associate food with being sick and might refuse you. What I always found worked best was just leave little plates of food around the place (buttered toast fingers with a smear of vegemite) if she is mobile and let her chose when and how much she wants to eat. Or sit her on the floor with some food and she can eat if she wants it or she will move away.