Not a DM, but i'm pretty sure, if you've played her for very long (though I'm assuming you haven't, since you'll be starting back at level one if you rebuild her), you'll need to get this approved in the Grievance forums. Basically, though, assuming it's fine with the DM's, you can remake her before the old one gets deleted, only, you'll have to change her name slightly so it doesn't conflict with the existing character. (maybe Dis'core) And so long as the characters are truly the same, it would make sense for those previous experiences to count and be written about in her journal.