B.B.
All three of my kids had reflux but my youngest had it the worse. He had problems from the day he was born.
We tried everything, the incline pillow, Pepcid, Zantac, etc... I even slept in a chair with him at night to keep him in an upright position because he was in so much pain. Finally, while waiting for an appointment with the GI, I went into the ped crying. She called the GI and they started him on Prevacid plus the Zantac. He was like a new baby.
When he started foods, he started having problems again. At 12 months he was diagnosed with eosinophilic esophagitis which is a swelling of the esophagus. We took him to an allergist and he was diagnosed with food allergies.
By two years old, he was off all medication. Although he had it the worst of my three, my oldest daughter is still on medication for reflux and she is 8 years old.
If you think she is still having problems, take her back to the ped. You are her only advocate so don't be afraid to press the issue.
Good luck.