Lactose intolerant

EMA

So I've been giving my 11month old milk products and I have been seeing change in poop. Usually it is water/diarrhea a couple minutes/hours after milk products and sometimes 2 times a day. Is she lactose intolerant?? Cheese doesn't affect her but milk and yogurt is another story. Should i keep giving her milk products to see if she out grows it? Any tips/ ideas ?

*she is formula fed (enfamil yellow)*