i have a cat that had kitens 11 weeks ago,she has stopped nursing them.she was spayed 2 weeks ago,since then she persistently poos behind our waste bin,also pees on the chairs in the lounge even though she has free access to a litter box and outside.this has only happened since she was spayed.i cant be having this,she is consequently banned from the lounge.(where the kits are)the kits on the other hand use the litter box and have no toilet problems.i just want to knopw what is going on in her head? we let the kits have the run of the house during the day,so she dose get to see them,she bites thier necks playfully but will not let them nurse.please help.