My mother has a Buick encore (mechanically the same as a trax IIRC). She has no issues in Northern Maine, but like others have said it really comes down to the tires. In high school I had a geo prizm and it was great with snow tires, equivalent or even slightly better than my silverado with all terrains.

Word is that a few of the stores that pay their own utilities will remain open (Harbor Freight, Dollar Tree, maybe a few others).

While there's only a handful of stores and businesses in there it's still quite a few jobs being lost relative to the population of the area. Hopefully it's short term, but it doesn't seem like the owner has a good track record.

This would really depend on how frequently medical intervention is needed. There are lots of people up here with serious conditions, but they generally travel to Bangor or Portland for the complicated care/procedures. If your cousin has lived in Aroostook County before she will be plenty familiar with the capabilities of local medicine.