You can try the enzyme therapy now. Unless you do you would not know if your daughter will see a benefit. Many of my patients do not see much difference in their symptoms when they try that therapy so you will have to wait and see. Lactose intolerance is not an allergy - rather an enzyme deficiency - and while supplementation may help with some of the symptoms there is no permanent or long-term solution.
Hope that helps.
Monika Korff, MD