A nursing degree will not hurt you provided you are able to answer the question “why MD/DO and not NP/DNP?” in a convincing way that does not involve speaking negatively of your previous profession.
A nursing degree will help add a unique aspect to your application and give you the added benefit of more experience in working with patients and their families, as well as a heightened awareness of psychosocial issues and their impact on the patient experience long before you set foot on your first medical student rotation.
However, do not OVERestimate the value of your nursing degree. For one thing, adcoms will be making sure you’ve taken the appropriate prerequisites (some, though certainly not all, nursing programs allow students to fulfill their science prerequisites by taking courses that are tailored for nursing/allied health professionals, such as “chemistry for the nursing profession.” These courses do not count towards fulfilling your med school prerequisites and will leave you poorly prepared for the MCAT).
As a non traditional, research is usually not expected (it can be difficult for some people to become involved in research if they’re no longer students or aren’t affiliated with an institution that does research) so kudos to you for having this on your application.
I certainly don’t want to make any assumptions about your life circumstances-whether you are a caregiver, working multiple jobs, etc. but it is almost a requirement that you find a way to add some volunteering/altruistic activity to your application. Adcoms want to see that you are caring for others even when you’re not getting paid. I understand this can be challenging for nontrads, but your app will suffer without it. Is there any possible way you can become involved at all in your community/house of worship/etc? It is not necessarily about zillions of hours, but rather a commitment with some continuity even if the hours per week you volunteer is on the lower side.
A nursing degree will make you a unique applicant, but will not make up for grades that are lacking or missing exttacurriculars. Since you are constantly in contact with physicians as a nurse, you don’t necessarily need to have formal shadowing, but you do need to emphasize in your job description in AMCAS that you were regularly exposed to doctors and have an understanding of what their day-to-day entails.
Do not rush the MCAT. Ideally you should only take it once, and take it when you’re ready. It is expensive and time consuming, and multiple scores can potentially hurt your application. If you are struggling in biochemistry, figure out why- study methods? Not able to attend class/office hours? Other life circumstances? Then do the best you can to address such circumstances (and if truly nothing can be done for the time being, you might need to delay your MCAT for a bit). Do not take the MCAT until you have successfully completed ALL the prerequisites and you are scoring in your target score range on practice exams. I cannot emphasize enough how important it is to take practice exams.
I am a nurse turned doctor (graduating MSIV) and I myself delayed my app due to life circumstances, so I speak from experience.
Best of luck to you!