I think the OP should do what is in her heart as long as she is healthy. Maybe see her health care provider and get a thorough exam just to be on the safe side. Then, if she isn't in shape, try a walking program or join a gym, get enough sleep, and eat healthy and see if that doesn't help her with stress. Certain hobbies also can help with stress. Yoga is helpful for me as is gardening.
I agree that she should either volunteer or work as a CNA/PCT first or while in school. It will help her network and also see what she is getting into. I volunteered in a really busy ER on the seedy side of town that got a lot of action. That led to a CNA job in that hospital which led to getting picked over thousands of applicants for a coveted Summer Nurse Extern Program which led to working as a nurse extern which led to job offers from that and many other hospitals before I even graduated. It also made me very very comfortable as a new grad. I ended up moving due to dh's job to the Midwest (from Phx) so even in a new environment where everything was different and the way they did nursing was different, I still had confidence that I never would have had, if I had not volunteered and worked before graduating.
When I was in nursing school, there were 2 people who were "older" in my class. One was 55. Both were successful and got hospital jobs. There was also a student in the class ahead of me who was 65. She still got hired after graduation. This was a BSN program and the times were a little better for new grads getting jobs so that might have made a difference.
Just another thought, the way many nurses are treated in America is similar to work conditions in some 3rd world countries. No bathroom breaks, food, drinks, way understaffed, working in unsafe conditions for nurses and patients. Then told to suck it up. Sounds like a sweat shop situation to me lol. We do get paid way better and have health insurance options. I guess that's the catch, but really, we need to band together and change this. Its really crazy if you think about it that nothing has been done already. I am guilty as anyone of going with the flow and saying, "Hey, I took care of 10 patients today! (Not counting the ones coming and going lol) and feeling proud of myself for making it through the shift and getting everything done on time somehow. How good was my care? These patients and the insurance companies are paying buku bucks to for a quality stay in a hospital ...way more than some super nice resort and all anyone cares about is how to give everything as cheap and as little as possible. Its shameful. OK end of rant lol.