It doesn't matter how heavy she is. People should be able to count on the ground in a public area if there is no posted warning or obvious hazard. She will have an excellent legal case.
Yup, that’s right. If it collapsed under her weight, it could have collapsed when 2 people walked on it, or 1 person with a loaded shopping cart, or 4 kids, take your pick. A person large enough to make in an unreasonable load would not be able to walk under their own power in the first place.