J.C.
When my grandson had this (Herpainger - I'm not sure of the spelling), his doctor recommended to make a mixture of Maalox and Tylenol and administer. To a tablespoon of Maalox add 2-4 drops of Tylenol. Then take your finger and dip it in the solution and rub on the top of the mouth and as far back as you are able without gagging your daughter. Worked for us.