As long as you keep your dialogue open with your daughter about the values you hope she adheres to, she can still enjoy parties like this. One of the wonderful things about feminism is that we women and our daughters get to make CHOICES for ourselves about how we present our femininity. If we want to be frilly and froufy and princessy, we can be. If we want to be tomboys, we can be. And we can be anything in between and interchangeable.
When we insist that our girls CAN'T and SHOULDN'T participate in these sorts of activities then we're actually fighting against what feminism is about.
As for whether or not boys will be there or they'll be excluded... that's such a non-issue. I've always let my daughters include their friends. They get to choose who attends their parties. I've never forced them to invite their entire class. So if that means "no boys" then tough noogies. My friends' sons have always been invited, even to our "Rockstar and Make-over Party" that we had. EVERYONE had frilly make-overs and nail polish and glitterized hair and it was a blast. If my daughter had chosen to make it all girls, I wouldn't have blinked. Just like when my friends' sons occasionally choose "all boys."
*No boys have been discriminated against nor marginalized in the posting of this comment.