Last night my 2 year old Siamese indoor cat started meowing a weird meow and circling around in the corner--then she just squatted down and pooped on the carpet right in front of me! She had access to her litter box, but she chose the living room floor...there have been no changes in her environment and no new animals...she appears healthy and it wasn't runny or anything...why would she do this? She has never done anything like this before...then I noticed that she had dug in a plant close to the area where she went, and she had urinated in the plant--I think when we were sleeping! What's going on??