^ i know right! elena and damon are on FIYAAAAAAAAAAA! however... i don't see elijah or anyone of his 'crew' could be on elena's side... after all, it's an almost life-saving reason why they would wanna KILL elena to break the curse right... i don't think the writers would put a loophole twist like that around the curse stuff cause it's already confusing enough with all the rules & legends...
although regarding elena, stefan and katherine, i read on tvd.net forums that there are rumours that elena stands in as katherine for a bit on the next episode? so maybe that's what the whole 'katherine'and stefan hook up is about... although i doubt that, as that would kinda defeat the purpose of stefan getting himself stuck in the tomb with katherine. or, more likely, it's elena standing in for katherine when elijah comes into the tomb because for some reason elena goes in... so maybe that's the scene you saw which made you think elijah is on elena's side