Why she would need a weapon in the middle of the night is not addressed.
Wasn't it already established that she had a Mets bat? That's a way better weapon, IMHO.
Rosie’s Success, and Failure: A Post-Mortem, or, “America, Say Goodbye to Jo-Jo the Dog-Faced Boy”
http://www.freerepublic.com/focus/f-chat/1823102/posts