know whats wrong? (pics added)

[flemish lops]

I had a litter of Flemish giants awhile ago and they are all growing great. They all have nice sleek fur, and a lot of flesh on there bones. All except one. She has a rough fur coat, and is rather scrawny. I have given her some de-worming.. stuff (can't think of the name right now) awhile ago and she is still the same. I also noticed that her droppings are smaller and black/brown, not the regular brown/brown look. Any ideas on what could be wrong with her?

 

[Hens and Roos]

is she eating and drinking well? would posting a picture of her compared to the others be possible.

 

[flemish lops]

A.

B.

Picture "A" is a brother of her's and picture "B" is the bunny that I think is sick Could she just have a bad coat of fur?
She is eating and drinking just fine. In fact whenever I go there she runs up to the door for greens just like my other rabbits.

 

[flemish lops]

Update: The bunny is still eating great, and I noticed that some new hairs are coming through her coat. Maybe that is what was making her coat so rough :/ . (I need to stop worring so much about the buns and get myself a hobby )