Can Cetirizine And Cranberry Apple Juice Be Taken Together?

My (step)daughter has taken cetirizine 10mg since she was about 2 years old. She is now 9 years old. The last couple of years or so, she has had to drink at least a glass of cranberry apple a day, if not she has other problems. Girl problems... I heard that mixing the 2 was not good for her, I even did my own research and I found the same answer. My husband(her dad) also called her doctor and the doctor and pharmacy said that they have never heard of this. I am confused and don t kno what to do. She needs the juice to prevent problems, honestly she has been taken normal benedryl when needed anyway instead of the script from doctors cause she doesn t need ALL year round anymore. I am stuck on what to do, PLEASE HELP!!!