Hollye, I don't think it's what she's eating/drinking that's making her vomit like that all the time. It sounds like she could have an issue with the sphincter muscle at the top of her stomach, like it's not closing and keeping food in her stomach, hence the constant vomiting. I would be taking her to get it assessed and see if that's what the problem is because the constant changing of her formula wont be doing her gut much good to start with kwim? Like you could try every formula on the market and still have this problem