She has been taught that inside the house = potty. That means *anywhere* inside the house. Eliminate the pee pads and start taking her outside every single time. Make the spot in the crate just large enough for her to lie down and turn around. Take her out every hour and praise her when she eliminates outside.
Also, thoroughly clean the crate with white vinegar and/or an enzyme cleaner.
Hello,
I’m sorry to hear about your guinea pig. Try to keep her warm and try to see a vet as quickly as possible. 8. Years old is very old for them and your vet would need to see your pig to help provide guidance and advice if she is not well.