Sorry Pom--- just spotted this post now. Freedom had some good advice as others also. Seems nothing is working for you though. Do you think maybe the colder weather is stopping her from going? The house is nice and warm---comparable to us having to use an outhouse right now although our weather is so warm we can wear sweats to go out. Today was one above C , hard to believe, the snow is almost gone.
Do you think if you took a pee pad and when she pees you could dab a bit of it on the pad so "her" smell will attract her to use it? Just an idea, not sure it will work but I remember housebreaking a dog this way...took a paper towel outside after an accident inside and staked it to a spot in the yard and bingo, no more accidents.
I was wondering if maybe her footing is better inside now that the ground is frozen and we have snow? Of course age can have a lot to do with it also. Are you sure she isn't pooling? As for the poop that's a hard one...could just be a preference...just forgive and forget ------she's so worth it