Javanese kittens & cats in Sebastopol, California

We adopted Tai from the Mendocino Inland Humane Society almost 4 years ago. She was a kitten who looked Siamese but it turned out she was also tortoise shell.She was kept indoors for the first year and except when our 2 dogs barked at her, she was very content and loving. We got her an orange tabby male companion cat about 3 months later and though they get along very well, they are not bonded. Tai enjoys living outdoors now and comes in for a good meal and a few pets. She is very independent but I think if she were the only cat, she might return to the people loving cat she was initially. We cannot keep her because we are living in Costa Rica now. Tai and her brother have been living in our home with caretakers. I must have a safe haven for our cat babies. Moving them to Costa Rica is not an option because the 2 dogs are with us and they make her life less than wonderful. Also the wild animals here are too dangerous for an outdoor kitty.