I have a new 7year old cat, just brought her home today. She is hiding, I have her in my study away from my other cats until she is adjusted. Her owner had to go to a nursing home. She did go to another home for about a month but it did not work out. She is not eating or drinking water or going to the litter box. Anyone experienced this before? What is the best thing I can do for her? While I sit on my computer I talk to her so she will get used to my voice.