cows milk protein intolerance

Nicola • My husband & I together 16yrs, married 5yr. Poppy born oct 2016, 4months off the pill, diagnosed reflux, breast fed baby
Can anyone help please? My LO started omeprazole 11 days ago (3rd drug to try for reflux), we were advised for me to try dairy free after a week (as she's Breast fed) and I have been doing it 3 days now. We have noticed a dramatic improvement in her reflux since starting omeprazole. 
Our dilemma is: could it be the omeprazole or the dairy free that's helping, is It too soon to see a difference with dairy free as I read it takes a bit to go out of her system? 
Any advise or experience please?