Hello,
Your daughter may be having GERD (gastroesophageal reflux disease) which is causing her to have such symptoms. Try Elevating the head of the baby's crib or bassinet, hold the baby upright for 30 minutes after a feeding, change feeding schedules and give solid foods to your daughter. If the symptoms persist then she may need medication for the same.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
I think you should try a community on babies, not on sleep.
http://www.medhelp.org/forums/Maternal--Child/show/82
Might provide some help/insight.