My first son was a reflux baby and continued to throw up profusely until he started standing regularly on his own. The pediatric gastro told us that would be when it would finally stop, and he was right. Made for a really long first year of life though. The good news was that even though he threw up constantly, he continued to grow and thrive and really wasn't "sick". I feel for your daughter having to deal with it though. It is stressful to not really know why it's happening and to really not be able to do anything to stop it.