Elegran
I wonder whether she is getting frail and isn't really well, and the sisters are taking advantage of this to bully her.? Animals know when another is weak and at their mercy.
I think that’s exactly it, when we had two cats ( one a good deal younger) he did the same to the older one, always getting into the other’s bed! It happened as time went on and the older cat became more frail.
We moved them apart ( the beds) and it stopped.
