My anti-social cat

It is confirmed that we cannot have a second cat. Past experiences of Bao Bei seeing another cat were usually nasty. Bao Bei had seen stray cats at Chartres and she puffed up and snarled like a crazy animal. We thought that this was because she was not at the comforts of her home.

One of my colleagues is going on three weeks of work trip and I volunteered to take care of her cat. We decided to do a trial on last sat where her cat would stay with us for a night. The moment Bao Bei saw Miya, she went crazy. She was snarling and rushed off to the balcony. Miya was a sweetie. She tried to approach Bao Bei and meowed at her in such a gentle manner. It was like 'Hey, let's be friends and play.' Bao Bei replied back growling, 'Go away'. I could not recongise that this was my cat. Throughout the whole night, Seb and I could not sleep as Miya tried to communicate with Bao Bei and we were scared that Bao Bei would hurt her. Miya was really a sweetie coming to play with us and sleeping with us. Bao Bei was really stress and afraid as she did not come into the house at all. We put her food and water outside but she hardly touched them. We could not approach her as she was too aggressive.

The next day, we returned Miya to her owner and were sorry that we could not keep her lovely cat for three weeks. Bao Bei is slowly getting back to normal life. More than 48 hours after the affair, she still stays in our room and would not want to venture into the living room. I guess Miya's scent is still around. I could not understand how she could be so anti-social. Is this the general character of black cats?