It does look like her gut has been a bit sluggish. Is she going through a molt? Was she eating well prior to this?
If she hasn’t been eating her cecatrophes, it’s possible her gut is a bit out of balance.
Can you tells us a little bit more about her? i.e. Age, weight (is she overweight?), regular diet, any health conditions.
Have a look over this page to see normal and abnormal poos.
http://www.medirabbit.com/EN/GI_diseases/drop/Drp_en.htm
My rabbit Jersey has irregular poo often and they can vary from small dark hard, to golden and over large. They are rarely perfectly round like you see with other rabbit poos. She had had bouts of stasis and I would see mucous when she would start toileting again. Usually like a plug of mucous. I have on occasion seen a bit when her output has been sluggish.
My other rabbit Jelly had sudden stasis at end of last year but when he started going again, his poo was unformed mush and more watery type mucous. He did have some jelly-like globs during the stasis. It indicated there was inflammation. From my understanding, the mucous is produced to protect the gut walls from the altered PH during inflammation.