I definitely would lessen the weekend activities if she can't keep up with the attitude. Perhaps she can hang out at a friends house till say 10 then you pick her up so she can sleep at home??? (after, of course, the grounding passes) Then she can have some friend time, but not be so hard to be around.
Mondays are always our rough days around here. Tired from the weekend, piano lesson, and the weekend mess I am trying to get cleaned up, makes for a VERY difficult morning.
Just saying that I've been there, more times than I care to admit. Hopefully we will all survive!