|Well, sorry this may be long.|
I hope your friend is really a friend and not an enemy. Used stuff is notorious for being junk. Not that she is a bad person but stuff does happen also. Don't freak out just yet.
It should not hibernate on it's own. It may be that you have to charge the battery for 24 hours and re-check.
I am kind of suspecting that the battery may be going bad.
1/3 of highway deaths are caused by drunks. The rest are by people who can't drive any better than a drunk.