Why is my 17 yr old cat all of a sudden hiding in places she normally would not go, like under the enclosed entertainment center, or under the recliner or on top of my kitchen cabinets about the refrigerator ? She was yowling every day a few weeks ago, then that stopped, and she started hiding. She only comes out at night to eat and use the litter box. I have been told by several people she is probably going to die and that is why she is hiding.