The story is that she was trying to commit suicide. The unasked and unanswered question is whether her ‘suicide’ was a solo act or one intended to take out others around her.
http://www.nbcnews.com/news/us-news/shooting-fort-lee-apparent-suicide-attempt-officials-say-n188331
If she barricaded herself then more than likely she was just plain trying for a very publicly noted suicide.
I doubt she is Moslem.
Besides, this is not Moslem MO. They prefer truly efficient killing - bombs.