She should be able to get sanpro for free inside.
I second make sure she has all the phone numbers she wants written down, addresses wouldn't go amiss either, plus stamps and envelopes, Apart from the first night phone call it might take a few days for phone access to get sorted out, it shouldn't but it does sometimes. She'll get a PIN number and the phone numbers she wants to use need to be added to it. Some prisons do this quicker than others.
She won't be able to take food in or have it sent it, but she will get a chance weekly to order a few snacks. Books, magazines, puzzle books, photos.
Don't take security restrictions personally, some people will do anything to get drugs into prison and the restrictions are there to keep everyone safer.
Also second whoever said tell her not to borrow or lend anything, not so much as a draw on someone else's cigarette.
I worked in prisons for 16 years. A lot of the staff and indeed many prisoners are decent people and will look out for her.