K.S.
From my experience, it can take some time for the diaper rash stuff to work. We have tried them all,and so far, the Buttpaste and the A&D original work the best. We use it on a regular basis now to prevent as well. Try to allow air time too. I use just a plain white cloth diaper for a few minutes at each changing. Also, be sue her bottom is completely dry before applying any ointment.
Good luck!