nexium and calcium absorbtion

Hi, My daughter has been on nexium and erythromycin for several months now and it seems to be doing the trick. Previously she would throw up at least once a day and we were going through tums and other meds to try and control it. Yesterday in the natural food shop I was telling the dr.? about her meds and also her problems with leg fractures from running. The lady said nexium and tums block the absorbtion of calcium into the bones which can make bones and teeth brittle.  She suggested gradually substituting acid-ease for the nexium and mega-zyme for the antibiotic which would help break down the food faster and giving a probiotic (acidophilus) once a day. This makes alot of sense to me and I was wondering if anyone else had tried this approach or had similar bone issues possibly from nexium.We are due to see the dr. today and I know she isnt a fan of natural remedies so it should be interesting!