Dinner is *at* prom. The limo ride is just to get there.
DD would not have issue with visiting with AG for a bit here and there. However, AG completely monopolized DD at Homecoming. Even when DD tried to slip away to spend time with someone else, AG literally *chased* her (as in - running!).
DD wants it to be clear that this girl is not part of their group - they won't tell her where/when they are getting the limo - but if she thinks she is part of the group, she won't make other arrangements, kwim? They absolutely do not want to continue to let her assume that she will be included in their plans/seating arrangements at dinner/group at afterprom, etc.
DD is hoping that the convo I mentioned above will be enough to get AG thinking that DD might actually be serious about not letting her tag along everywhere she goes at prom. The group is by no means "circling the wagons" - for the members that have dates this is merely a blip on the radar - "Oh - no - AG isn't in our group" - it's the girls that are going without dates (AG1, AG2, DD, BFF) that are trying to prevent a rerun of Homecoming for my DD and themselves since they have been named by AG as the people she is spending time with.
It's kind of sad - last night DD said, "I wish I wasn't so nice. Then these things wouldn't happen to me." (she IS that typical nice girl - nice to everyone, smart, pretty, etc, etc). I, of course, said she should absolutely be nice! But that nice doesn't equal doormat or being taken advantage of. I told her you can be nice and still be firm with people.
In regards to the stalker/crush thing - I don't think it's an issue - I think AG is just completely socially clueless and a bit odd. Unfortunately, DD has already had issues with another student with stalker-ish behaviors, the police have been involved, etc, so we are pretty aware of stuff like that.