1st, confine her where she cant chew anything when you arent around.
2nd, get her to chew when you are around. Correct her, then give her something she CAN chew and praise the crap outta her when she take/chews it. Continue this and you'll shortly be successful.
Thats the short course anyway.
Some rawhides are processed with caustic chemicals and if they are not properly washed in the process can be toxic, altho usually on small dogs. I also forgo them completely.
My #1 female was not a chewer except under 1 circumstance. Immediately after we left the house to go to work. (we videotaped her all day for a while) She would spend 15 minutes absolutely destroying (usually newspaper we left for that purpose) something. Then she was fine the rest of the day. (Oh, she had a male Akita playmate, so that wasnt it). This destroyed the old myth about how your dog does all the damage in the 15 minutes you arel late getting home from work, at least for me.
What did we do? Not much. Left her plenty of toys, but not all at the same time. Like children they get bored with the same toy selection day after day, so we took up about 1/3 of the toys and rotated the 'missing' third every few days. It seemed to keep the interest in toys fresh in the dogs. And lots of praise for corect chewing......etcetcetc.
Good luck. This takes time and patience, but they usually grow out of it (I think)..