What is the cheapest, fastest nursing program for someone with an Exercise Science Bachelor's from 2018?

Tittle says it all. My girlfriend is looking to go get her BSN. Every program I've found is private and like 70K for 18 months. Is that really how expensive it is? She has a bachelor's in exercise science and has been a nursing assistant/unit coordinator for 3 years now. She feels very confident in her ability to be a nurse but just needs the darn degree to get the job and the pay. She lives in Saint Paul and is willing to commute to Minneapolis.

Thoughts?