Sounds like she may already be at her optimal weight. Check out http://www.halls.md/ideal-weight/body.htm for information on that. Also, because she's so close to her goal weight already, she may not lose much at this point. The body's tendency is to hold on to fat, and if she's a mesomorph that's probably exacerbated due to body type. If she does lose any more, it'll probably be around a quarter-pound a week, tops.