She got a pretty short sentence, to be served in multiple short periods of incarceration. I suppose so she isn't away from the kids very long at a time.
I think they took pity on her, as it was the guy's idea, he assured her it would be safe, she had one kid, and had another one on the way at the time of the incident.
Of course, if she were black she'd probably be in for life.
Now in jail: http://www.bbc.com/news/world-us-canada-43410816