glasfryn
cleaning up cat sick
Their might be another cat which is marking its territory round your house and your cat is afraid to go out .
you might just have something there.
we had a blind cat who really was never house trained by her previous owner and we used to use puppy training pads, she is old and the pads as long as she can find them could do the job.
might also be a good thing to take her to a vet just in case there is something wrong .
this sort of behavior is normally a territorial thing, if you do not find anything wrong it could be she is nervous about something ,try her with rescue remedy either in her water (4 drops) or on the tips of her ears.
something I learned on the way to taming long time strays and even ferrel cats
my other half has just read this and she says the cat is trying to tell you something ..............you just have to watch her and try and find out what it is .............have she/you changed anything, moved furniture,is she crying a lot(signs of dementia)or pain
over to you and good luck.
just noticed you have written "she will not go outside" classic case of another cat/human bullying her, or something out there she does not like