I would ask to tour your local NICU and see what to expect.
Ask her what kind of care she is getting. If she is delivering early, they most likley will suggest steriods to help mature the babies lungs. If urgent medical care is needed be prepared---who will make those choices? Lot of Questions can be answered if you talk to a Peri or neonatologist about IGUR and 31 week preemies (outcomes, risks of NEC, lung condition, etc). The choice for blood transfusions, vents, etc will probably occur and you should talk to the expecting mom. NICU is almost guarenteed before 34 weeks. Mine stayed 4 and 5 weeks.
I have 31.6 weekers. They are now 4. They are doing fabulous. We do have a few remnants of preemie life, but they are minor and totally non-issues for the most part.
They were an emergency C-section due to Baby B in distress.At birth, they were vented & both had blood transfusions. Both were fed via TPN and nasal tube--they did not try to bottle fed until 34 weeks gestation. They were small---but my 'smaller baby' (3.8 lbs) did better than my bigger baby (3.14 oz) and came home sooner. They both were on blood pressure meds & caffine for brady/apnea. We had monitors on then for the first 7/8 months. They did great and were involved in Early Intervention from the start. They had some gross motor delays (one still does) and had physical and occupational therapy (one still gets these), but both are reading, writing, talking, running, funny little girls that are academically doing very very well. One DD has caught up physically and the other still has some delays---but they are fantastic little people that chatter all day long.
The NICU is hard, but ask questions and get involved!! And I hope it all works out well for your family.