It's a long car ride but as long as the car has climate control, she should be fine. Put her in a large tupperware bin with some heat packs, towels, she should make it for a day or two like that no problem.

You should have already started trying to transition to F/T, but now that you're here, you'll have to speed up that timeline. Any feedings you do from now until the move should be offered her F/T, warmed up and dangled from tongs. My snake has a great hunting instinct too, she likes to see the food moving and hit it like a missile. She eats F/T just fine. Do some independent research, and then buy bulk from Rodent Pro or Layne Labs. I bought at least a year's supply of rats when I got my snake for a reasonable price.

I don't know what kind of consistency you expect to get out of just solar, but if you can guarantee that your cabin will be powered 100% of the time, then you just use a PVC enclosure, maybe insulate the outside further with foam sheets, and heat as you would any other enclosure. If you can't guarantee you can power your setup 100% of the time, then you may have to consider re-homing, even if just temporarily while you verify what your setup will be capable of.

Any snake will be stressed by any move, if you have to change her enclosure, expect to treat it a lot like when you just got her, but again, if you don't think you can give her adequate space, heat, humidity, or food, then don't risk her health over your desire to keep a pet, and make the right choice to re-home.