Our 5 year old Female cat, Oreo, has suddenly become afraid of us and will run and hide behind the couch when we come into the room. She is normally friendly and wouldn't do this. She isn't aggressive when you try to pet her, she just tries hiding from, and avoiding your hand. I'm unaware of any of us accidentally hurting her or scaring her.
I've also noticed that she has started urinating inside when she would normally go toilet outside in the garden somewhere. She would scratch at the door to let us know she wants to go outside. She doesn't meow to be let in anymore either.
What's going on? Should we take her to the vet?
Any help would be much appreciated.