It's so horrible

layla eats Fromm dry food and was eating the White FIsh and Potatoe flavored food and i though it woul dbe nice if i made her next bag a diffferent flavour.. the lady at the store said that changing within the brand shouldn't bother her tummy but since eating the Salmon flavoured (we are going gradually from one to the other) she has had just horrible gas...do you think it could be from the food?? i also started re-introducing yogurt at this time... do you think her tummy will adjust?