"Load it up and get it weighed" really isn't necessary here.
The car has 1150lbs of payload capacity.
15% of 2000lbs is 300lbs of tongue weight.
That leaves 850lbs for her, and anything she brings along in the car. She would have to work HARD to get 850lbs of people and stuff in that little car.
She could bring along her own accommodations, but they likely won't be terribly comfortable, especially if she has any physical limitations. You really don't say if she's a fit 50-60-70-something, or maybe has some arthritis going on.
Smallest fully self-contained units that don't require a ton of set-up are the single-axle travel trailers like the AR-ONE series and similar. Those require a midsize SUV with at least a 3500lb tow rating.
