Even if....**spoilers**
she got away in the end, she won't be free for long. That's what makes that ending so stupid aside from the fact that it was so abrupt. So she kills everyone so her other secret doesn't get out, but tell me how she is going to keep these murders secret? Her prints would be on the cuffs and the pole and the gun that she killed the last three with and then DROPPED on the floor on her way out. Plus, she was in there way too long to not leave other evidence like strands of hair, etc. The police will know she was there. There is NO WAY she will get away with it. I don't care if she is a district attorney. This situation would be too much for her to try and cover up.
~**~
She belongs to you...You took her life and gave her a new one, a life extraordinary.