Hun, I would go with Christy's suggestion. Quite a number of people who have dairy issues are also allergic to soy. I think it's like 50%? I don't know about why she's reacted to the yoghurt when she's been having formula, you'd need to speak to a dietician or allergist for that I think. Hopefully someone on here will be able to shed some light!

Or it could be something else in the yoghurt, not the soy