I have a sister that is 15 years old she has been in and out of doctors office this week She is still in a lot of pain in her belly around her belly button and to her left side. She ate 1 hour ago and now its worse. Can she take a hydro 7.5 or a half of one for comfort till morning roads are bad and can't get to ER.

If it is not prescribed for her. No, do not give it to her.

No, since we do not know what is wrong with her belly. In and out of the doctors, what have they said was wrong ?

But she tells her parents and her parents decides what they want to do, a sister, and I am guessing younger isnot the one to decide