I've had a problem with the conflicting reports of LS's intentions vs. her appearance.
1. If her intentions were to go put CR to bed, I'd think that she couldn't have really been THAT out of it.
2. If she was really THAT out of it, then would she really be wanting to go out for more drugs? If she's foaming at the mouth, falling down on her knees, and needing to be scooped up by a boy and helped out of the building, would she really be even asking MB to party, less than an hour later, and presumably two hours later maybe going to a DD's house for more? I don't think so.
I think it's one or the other - she was not a "messed up" as described, and ready for more action -possibly went out to the DD's house for more - or she was really really messed up and OD'd at 5 North. Honestly, if she was THAT bad, I can't imagine that she was even capable of leaving JR's 2 hours later, nor that he would have allowed it.