Ah yes, @Vectis, Inky has had a few little "indiscretions" involving our bed. Including the time when she did it twice in one evening, after I'd changed the bed.
I'm glad I'm not the only one!
Her main toileting place is her digging tower. Where she also sleeps. And hoards. Unfortunately this means that any 'spot' cleaning inevitably involves removing her nest and hoard, as otherwise it starts to smell.
Le sigh.