Did you have her looked over by the vet when she began having problems in the house? She may have an ongoing problem that is now worsening.
Is she still eating and drinking normally? How about eliminating? Do you give her any supplements? (If she has a touch of arthritis, some chondroitin/glucosamine supplements might do her a world of good
I hope you allow her back in the house at least till she sees a vet, especially since it's beginning to get cold. If she's ill, she needs to be warm and watched.
for a quick recovery for your girl. I hope the vet finds something that he can treat easily.