I'm a few months behind, but I just wanted to thank everyone for their feedback.
I ended up leaving Kit-Kat with my mom's friend, who has been taking care of cats for over 50 years. She already had one cat, but who had recently lost her "friend", so she was used to having another cat in the house. Although their was a bit of friction at first, they now tolerate each other without any problems.
Kit-Kat is being spoiled with great food, lots of love and lots of places to sleep. I do miss her, but now that I'm in Brazil and see my lifestyle, I think leaving her back home with a friend was the best decision I could have made for her!
Again, thanks for your feedback and suggestions!