My baby has dairy/Yogurt allergies?

Are you breastfeeding or bottle feeding her? If she is bottle feeding and on a milk based formula she would have reacted to the formula if she was lactose intollerant. If she was on a lactose-free or soy formula or breastfed and you don't consume lactose containing products, then this very well might have been a reaction. I would try a soy yogurt (But check them because some of them contain milk as well) or just skip the dairy products for now.