Welcome to PT!!! You'll love it here and you'll also learn a lot. I'm so sorry to hear about your cat Max. As Lisa said, introducing her slowly is the key. You can also get a towel and rub it on her to get her scent on it and then get another towel and rub it on your other cat. Then switch towels and let each cat smell them and get used to the other ones scent. You can also do this with your dog too. Good luck and we love seeing pictures.