The female won't eat, she will walk around in circles & she will act like she doesn't know what to do; even though it may not be her first time @ giving birth. Hopefuly you will already have a box or a corner in a room with a small blanket, (you may need to remove & replace it). Show her the spot and gently push her down in the spot, although she won't want to lay down. Talk to her gently, rub her belly. You should be able to feel contractions, if so stay with her, she may need your help. If you don't feel any contractions, keep an eye on her throughout the day. It takes 63 days after conception for a cat to give birth.