I would stop the pellets and give lots of hay (different kinds, like second crop, timothy...) and wet leafy greens until the poop gets back to normal. If you don't give her greens at all, don't stop giving pellets entirely but give a lot less of them (and you should begin to introduce vegetables when she gets better). Her guts are slow, she needs fibers and hydratation to make them move. If it doesn't get better after a few days, I would take her to the vet - she'll probably need a gut stimulant like Reglan / Emeprid to help them and it will be a good occasion to make sure there isn't an underlaying condition causing the anorexia. The risk if she eats less and less is GI stasis and the guts stopping completely. At this point, you'll have a real problem. Keep an eye on your rabbit and empty the litterbox often to be able to watch her poop : if the poop gets really tiny, or worse stops, or that your rabbit stops eating staying hunched (sitting in a 'hen' position), you'll need to get her to a vet immediately. Stasis is treatable, but only if you react very quickly. As a side note, you should think about spaying your bunny. You were asked if she was spayed because a lot of issues are caused by hormones - phantom pregnancies, pyometras, mastitis and ovarian / uterine cancer which can appear very early on and are a 80% risk at around 5 years. I hope she'll be back to normal quickly!