She returns in Book 4 as a spirit and regains her human form in Book 5.
Yes Elena does come back and she floats because the gravity has not struck her yet and she also acts different she has to kiss to know a person very well.
she comes back as a vampire, then a spirit but changes into a full human but can still sometimes use her white spirit power[good power]
yes, at the very end of dark reunion(book 4) she comes back as a mortal.
In the books no but in the TV show it has been revealed that she's still alive and never cared about him.
Vampire Diaries will be returning April 7th in the United States.
October 11 2012
21st January
yes on the 24th
october fifth on ITV2
March 15th
March 15th
This autumn.... I can't wait!