To add to that, how does she look (to herself) in her clothes. She is probably noticing positive improvements based on these numbers. Also, muscle weighs more than fat, so while her weight appears to stagnate, she may still be chipping away at the BF.
It's probably a little early for her (and everybody on here is going to slam/flame/kill me) but I'm going to suggest eating a candy bar to get past the sticking point.
I know, I know, the air pressure just dropped as everybody gasped at that read, but I'm telling you, I've done it & I've seen it work. (I think it has to do with drastic calorie dropping actually slowing metabolism - I'm sure Freak could say).
I had seadily lost about 1-1.5 lbs / week, 8 weeks solid once (while dropping bF) when I stagnated. For like 2 weeks - no change in either. I actually ate the candy bar out of frustration (and it doesn't have to be a candy bar, any high colorie nutrient devoid comfort type of food - cake -
ice cream, whatever she has been depriving herself of). Believe it or not, it was like 'greasing' the wheels. Maybe because of tricking the metabolism, maybe just the guilt of eating it & how hard I trained after - who knows (or cares). The result was, that very week, I began to loose both weight & BF again. My losses were at a lower rate than before, (but obviously much higher than the two weeks with no loss).
It may not work for everyone, but it surely did work for me.