My son was delivered at 32 weeks.
The hospital should bring in a pump for her but she will need a good double electric pump (like a Medela Pump In Style or rent a hospital grade one once she comes home). She will need to pump every 3 hours just as if baby were nursing. She can try to nurse him while he's in the hospital and I highly recommend that. I had to work with my son for 6 weeks after he came home to teach him to nurse because we didn't get a lot of opportunities in the hospital.
You can also be an advocate for her at the hospital and make sure they know to bring her a pump as soon as possible. I was barely able to sit up after my c-section and they wheeled in the pump for me. She won't get much-just some colostrum at first and her milk will come in in a couple of days. She just has to keep up with the pumping to build a supply for the baby.
Nursing bras will be helpful after she is out of the hospital since she'll be pumping round the clock.
She will need some breastmilk storage bags once she is home. Gerber brand worked great for me. She will need to write the amount, date and time on the bags. Get her a sharpie. Our hospital also had us place the Gerber bags inside a gallon size bag just in case a bag leaked it wouldn't contaminate everything in the NICU freezer.
Also, get her some of the Medela Steam Clean bags. It will make cleaning/sterilizing her pump parts a breeze. I so wish I'd had those with my son. I had to sterilize after every. single. pumping. session!
After about a week or two our son could start wearing clothes because he had way less tubes and such. The hospital did have clothes but we wanted him in his own. Don't get a ton of preemie things though just a few onsies and some socks would be good.
My son was there 6 weeks and he was a healthy preemie without many issues. I had been given steroids to help mature his lungs.
Best to her and baby!