So what, they strap a wide load sign on her and transport her to a zoo?
Nah. At risk for powerlvling, they transport the body to the nearest "big" city (usually via non-emergency ambulance, or if you go thru a reputable funeral home, via hearse) that has one rated for people that heavy. Most smaller towns won't have one, but (at least here in the "Dirty Souf" ) there are ones in every moderately large/large city.
We got a lotta fat fucks down here, and cremation is cheaper than burial, even if you have to ship them off for it.