Is your older cat declawed?

When you declaw your cat, they sometime adopt new behaviors. Their claws make them feel secure, and when you declaw your cat, they have no way to protect themselves, thus they feel insecure and they sometimes resort to odd behaviors.

I knew someone who had a cat recently declawed, and the cat started peeing/spraying everywhere.

Like many others have said on the forum, your cat may be in pain due to the declawing. It's like breaking your finger by the knuckle, when you declaw, so I'd take her to the vet as others have suggested. Please don't give up yet. Your kitty has already gone through a very painful ordeal, and surrending her (or him?? sorry!) may make her feel abandoned as well. Good luck. Please let us know how things go.