DS8 had something like this going on and I just told him he needed to figure it out so I'd see if she can solve it. Maybe you could walk through some scenarios with her but it seems like a good opportunity to practice standing up to people you generally like but who are being rigid and annoying.
Plus, I suspect it is more that the kids like having rules to enforce on someone. Perhaps some are often the one in the middle with divorced parents who share custody?
Just my two cents but I'd tell her you are happy to talk about it but they're her friends and she needs to work this out herself.
