My DD won a 3 year AD scholarship in Spring 2016 for AROTC nursing. The criteria and the Student, Athlete, Leader model is the same (service falls under leadership on the application), however, it works a little different. A question I have never gotten answered was are they in the big OML list, or do nurses have their own. My guess (which is worth less than 2 cents), is that they are on the big OML list and nurse slots are filled from that list until they are full. For nurses, think several hundred slots per year instead of thousands. There is a really good reason for this, this fall, there were 3,112 "spots" for line officers during the branching process for those commissioning this school year. I can't find the nursing allocation for this school year, but I know the last few years it has been under 250, maybe even a lot lower than that. The rumor has been that the mission for nurses is decreasing, as most branches are having good success getting officer candidates that are already nurses.
So to further answer your question of what criteria? The same exact criteria and the same exact process to board and select an OML number that is then compared against every other nursing applicant on the OML. My DD was also a ballet and modern dance dancer most of her life as well as a swimmer. So she didn't have a lot of the team sport items on her application. Since your daughters are dancers, and for my daughter combining the rigorous demands of competitive swimming, you also understand she didn't have a lot of time to do other things other than go to school and get good grades. So she made the decision after her sophomore year (and being in Germany as an exchange student offered a clean break) to not continue with dance and swimming Junior year. This allowed her to get a job as a nanny, volunteer at the hospital, run cross country, and be a group leader at church for both middle school and high school during that last year of high school that was on her application. That was her choice because she did not feel "well rounded" enough. This was a big discussion at her PMS interview by the way, and she felt like because she had a very solid reason and strategy for changing course, it was taken favorably by the PMS.
There is not a different criteria, simply because the OML process is congruent and identical to every other applicant. The difference is your daughters will need to be in the top few hundred applicants for nursing rather than the top few thousand of everyone. That being said, I have never seen a number of how many nursing applicants there are, obviously there are a lot fewer.
One side note to know. My daughter decided sophomore year she did not want to be a nurse. It worked out for her that she was allowed to keep her scholarship (minus one semester) and transfer to a line scholarship, but that is not guaranteed and she got lucky that all the stars aligned with her specific battalion and brigade. If you have any questions about that or anything else, feel free to PM me.