Bonnie,
My father received the injection every day and he took a compazine pill about 1 hour before every injection. He also drank about 3 bottles of water prior to every injection. I believed that really helped toward the end, the water was difficult to get down. He was able to take the shot every day except for the last three when he developed a rash in the area of the injection which they considered an allergic reaction and stopped the shots. We were fortunate as I know many on this forum had trouble. His dentist says he has more saliva than would be expected eventhough my father says he is really dry. He also started taking the prescription pill Evoxac after treatment is over so don't really know what has helped. He had very aggressive radiation in a very large area since he was unknown primary so the saliva gland area was hit hard. I wrote down a "to do" list for lack of a better word of the items he had to do every day prior to treatment and after treatment. We kept them posted on the frig. He was very happy to tear them down when we were finished.
Good luck to you and your daughter - you can do it!
Kim