Provide her food more often throughout the day but in lesser quantities. This will allow her to burn off the excess food she is definitely eating if she is gaining weight while doing this... Also be cautious of a lot of activity immediately after the feeding.
If the problem persists, I would at least phone a qualified veterinarian (most good ones will take these calls on phone to offer quick advice - or solutions). Definitely is not normal for any bird to be regurgitating regularly, unless it is a mating behavior (Adults) or a bad habit where the little birdy likes to have a "second tasting" LOL