I'm sorry NyaChan but this right here is where I would have told her to stay home; that she is not to come over already drunk. full stop. Especially in light of the fact that you already know she can't be trusted to not drive drunk. Why would you take her at her word at all?
It also sounds like you had the support of the group even though you say that forcing her out would be unprecedented. Then, don't let her drive, drop her off at home on your way to the store and let her pick up her car in the morning.
I'm not sure the best way to convey it, but essentially, I was angry later because she did lie to me about her condition over the course of those texts. I took her at her word, because it would have been no trouble whatsoever for someone to pick her up on their way (heck, I could have picked her up) and we both knew it, so as far as I knew, she had no reason to lie. She never before hid something like that - I know she has driven drunk precisely because she doesn't lie about it. Now I know better.
weeble - yes, this is the Ring Saga girl. I had stopped inviting her to things, but Jenny and Todd for reasons I don't understand have essentially treated her as if nothing had happened and that they are all still friends. As a result, I eventually ended up spending as much time with her as we did before because I was the only one not initiating plans with her. The plans for this event evolved in a group discussion which included the Ring Saga girl, so she was also invited when I sent out the email about it as I felt it would be rude to offer to host a group event and then exclude someone who was in the group talking about it. I won't be inviting her again to things that I am organizing.
I can't imagine inviting someone to my home for an all nighter that I didn't trust enough to leave alone for a few minutes. Weren't you going to sleep at some point? Whatever it is that you think she may do while you are at the store, couldn't she also do while you are sleeping? In other words, just don't invite her if she is that untrustworthy. I might have some weird friends but none that I'd feel uncomfortable leaving in my home for a short period of time. She obviously just needs to be left off the guest list.
I see leaving someone alone for a few minutes while I'm in the same apartment and there are at least 3 other people around as different from leaving someone completely alone in my apartment for what could take 30 minutes. I don't mind leaving her alone in my living room, kitchen, or bathroom, but having my entire apartment available to her - my bedroom for example - while I'm not there makes me uncomfortable. It would make me uncomfortable to leave my mom alone in my apartment really, though I recognize that this isn't normal and I may be beyond what can be considered reasonable. It is just that in my family, privacy is a foreign concept. My mom doesn't think anything of going through any cabinet or drawer that takes her fancy - in her mind, there shouldn't be anything in my apartment that I wouldn't mind anyone, even a stranger, looking at, so if she does look, there should be nothing wrong with it. As a result, I get very protective of what little privacy I can enforce. My computer for example is something that I rarely allow anyone else to access since it is the only place I can keep to myself.