The other thing I thought was to make sure she doesnt have gastro...Imnot sure what it does in babies as Charlotte has never had it, but I know what it did to me and it also fits...
I would go an dsee the CHN and get the to write everything down - when she feeds, how much, when she vomits, poos, if she is in pain, unsettled, etc so that theycan show the nurse.