While I can't give too much personal info I will say this. my undergrad GPA was a 3.29, but I also have an MPH, and come from a diverse life background. Columbia has room for many individuals, takes a pretty large cohort (180-200 students on average), and it truly takes a holistic approach to applications and every year is making acceptance more accessible while still maintaining its standards. We have students from all walks of life, alot of amazing minds and great people, alot of competitive folk too. It is an ivy after all. Make sure to be sincere and shine in your essays, get all your pre-reqs in, and just make you, not your grades, speak for you. Let the adcom in a little bit into the real, palpable you. Being a nurse means being able to connect to humanity, to have a warmth in your soul that allows you to connect to those in need of healing. The video essay is a great tool for the adcom to get to know you. Everyone here is pretty amazing, I must say, really caring and open. Please do not feel afraid to reach out to them, with any concerns.
In reference to your Global Initiatives Placement discussion, I did not have that as part of my application process, though Columbia has made their Global department an important part of our program. You will have an amazing Global Health course in your first summer. You will also get to meet those of us in the current cohort who will end up going abroad come Spring. Not sure what the Global Initiative Discussion entails, so can't really speak on it.