The spaying is really the only thing that will help at this point. Rabbits mark their terrority by pooing around it, and because she's hormonal and territorial, that's what she's doing.
We are as gods to the beasts of the fields. We order the time o' their birth and the time o' their death. Between times, we ha' a duty. - Terry Pratchett.
"Men have forgotten this truth", said the fox, "But you must not forget it. You become responsible, forever, for what you have tamed. - Antoine de Saint-Exupéry