FawkesthePhoenix wrote:oh yeah! that just leaves the quetion of how ginny got out when she was possessed.
Ginny was brought down by Tom Riddle to the Chamber of Secrets once, with the intention of killing her. The other times, she summonned the Baselisk from somewhere more accessible, most probably from the bathroom.
If I'm wrong, and she actually went to the Chamber more than that one time, keep in mind that when Tom Riddle discovered the Chamber of Secrets all those years ago, he would have been the only one to go down there. That means he would have ensured there was a way out that relied on no one -- or nothing -- else. The secret of this exit or way of getting out may have been used by Ginny, but she was never aware of it because Riddle was possessing her. When Harry defeated the Memory Riddle, all knowledge of the second exit disappeared with the Memory Riddle.