Can you fully research what support services she would receive in Maine both now, and after she turns 18/graduates from HS at 21? Then use that to help you make a decision.
If you don't have other family/friends in Minnesota, it sounds like it would be better to move. Perhaps she would receive in-home support services that would allow her to stay living with you if you wanted that, or she'd have even more options in Maine! Or maybe not. But you can find out.
Also, keep in mind that living in a support home isn't a lifetime decision. You can move her to a different home or switch services. It certainly could be harder if she finds a great place that she likes living in, but better to research that now.
Early intervention specialist and parent consultant since 2002.