This lady, she is being totally unreasonable. I am sure in her head she is not, but your singer did not go over and pick her camera up and throw it on the ground. Didn't even go pick it up and drop it, like in her little example. He bumped into a table. I mean, WTH? Tables at bars and grills get bumped all the time. He did not intentionally break her camera. She needs to take care of her stuff and be responsible for her stuff. This is 100% on her.
I hope this works out ok for your band. I get fired up hearing about people behaving this way. There are way too many people out there that behave like children.