Have you tried brushing her?
Have you given her the brush test yet? My guess is that she is trying to groom herself - but sometimes they get carried away. Gabe does lots of licking of his fur. I brush him every morning, when he is sitting on the basin watching me get ready for work. The other two monkeys never get brushed. They have very short, silky fur and just don't need brushing. Maybe as they get older they will, but right now they are just fur and bones, no meat on them.....
Once she gets spayed she might lighten up a bit.
:)