Yeah...I think I'm with Mom on this one. Kids get scrapes, no biggie. I get where you're coming from, but I think I would have just made the suggestion of wearing pants to protect her knees, then the Mom could take it or leave it. It's not like it's a ridiculous situation where it's snowing out and she's wearing sandals or something neglectful like that. She's definitely entitled to dress her child in shorts in warm weather- I'm not sure I would receive that well either.