I think people are way too sue-happy and we only end up paying for it with higher prices to accommodate everyone being sued.

Unless the business ran out and pushed her down or set up a trip-wire, I don't think the tripper has any reason to feel the business is accountable. Sidewalks are uneven sometimes, they get weathered and damaged. It's a fact of life. I've stumbled on curves or rocks or my own shoelaces, it happens. I could see someone having a case against the business if they slipped inside the business on a wet floor that had no wet floor sign and were badly injured, but not in this case. More than likely she has some muscle strain or soft tissue injuries from it that will heal just fine with a bit of time and some ibuprofen or other over-the-counter anti-inflammatory.