She did a good job except for a few things. Apparently she went downstairs and yelled at him, before she went back upstairs and got the shot gun. The other thing is, the kid pulled a gun on her. Now maybe he didn't point it at her, or what...but she is braver than me. I would've blown the kid away right then. I'm taking no risk to my own life.
Also, I think if she were home alone, she did an awesome job. Not to downplay women at all, but if that were my pregnant wife, I'd be pretty pissed she didn't wake me up and let me handle it. Again, not because she's a woman, but because she was not only putting herself in danger, but my child as well.