A.H.
Try just putting a capful of baby shampoo in the water.. and then just letting her sit in the tub.. when she gets out of the tub.. dry her real good.. and then put a little diaper rash cream on the vaginal area.. this will help too. My daugther sometimes itches.. and it means that she is a little sore down there sometimes from soap and sometimes from wetness. I used diaper rash cream and it helps.. good luck..