You could also do it by explaining in gentle terms why you have left the kids, as a way to approach her about the behaviour that is affecting your kids - something along the lines of "I know both our DD's get a bit overexcited and hypo when the see each other" and see if that is a lead in for her to talk about it. Sounds like she is already doing a fabulous job and even if you bring it up she wouldn't know what else to do about her DD, and she probably sees it as well?? Not much help sorry Tough one hun, my DD gets super excited with her best friend around who she only sees every 6 mths or so but they just get loud and silly at worst so Im not really much help. xoxo