T.F.
Sounds like its like road rash which is painful.
It's important to keep it clean. I understand why she doesn't want water, it does and it will hurt a few days.
Depending on the wounds, I might see a Dr just to make sure to keep infection away.
I had a horrible road rash type injury on my knee when I was a teen. Very painful. I slept between a white sheet, kept it clean and it aired out a lot.
My husband had road rash after a car accident and he was prescribed Silvadine ( might be misspelled) which was an ointment for burns/road rash.
Good luck, I know it is painful.