I am not applying to Frontier but I do have a non-nursing BS and just an ADN with zero experience. I just got into a few university RN-MSN program with entrance gpa and grad entry test requirements, plus experience requirements that I didn't meet. I'm probationary since the gpa min. was 3.2 vs the normal 3.0 but I didn't have any real problems and I don't think they have to stick to all the written requirements.
All else being equal I can't imagine a non-nursing BS being a problem. Obviously, they have to be used to it otherwise these programs wouldn't exist and there are lots of them. I think you'll probably be fine.
Good luck and don't worry.