Sandals seem like an odd choice of footwear for sightseeing unless she didn’t plan to walk very far. Looks to me like her center of gravity shifted and she slipped. She has had a tough time going down stairs in the past, so it is not surprising she was hanging on to the guy during the decent.
Looks like she’s wearing Birkenstocks. The official footwear of the left wing nut job. Is the ensemble finished with an organic hemp top?