1. DCF is not available if you aren't married.
2. Marriage is not possible until her divorce is final
3. She cannot enter the US as a visitor (including VWP, an F-1, etc) with the intent to stay and adjust status.
You can move back whenever you want. Then you could establish physical domicile and find employment. No couple likes to be separated, but immigration, sometimes, requires it. Some of us were separated for more than a year. It isn't fun, but it can be done.
Another option is to re-locate to SK, marry, secure employment in the US, and seek the DCF route.
Good luck in your journey.