If she's a 2011, I wouldn't go bigger than a medium rat and I'd stick to feeding her every 14 days. She is lovely and does not appear overweight, but she is still fairly big for a 2011.

Slower growth is better for boas. A medium rat will do her quite well for a long time. I have several 2011's and they are all eating small rats at this point. I have one snake that is close to her size and it is a 2010 male Argentine. He is eating medium rats every 2 weeks.

She really is a very pretty girl!