The 2011 timeline is kinda messed up, because shouldn't the prom be in late april , or may not in feb? Plus bonnie died bringing jeremy back the day before graduation, which is in early june not in feb.
Yes, the timeline is all messed up. But I blame it on the writers. Although they spaced the episodes as if each happened on one month but have characters saing that they happened "yesterday" or "a few days ago".
I think perhaps there could be a much larger time jump between the first and second episode of season 4 than we think, in our timeline we say its been a week, perhaps it could of been at least 3 weeks, maybe more time passes after Elena burnt her house down, to like 1-2 weeks. Not that it will make the timeline any less better.