Thanks for the input guys! The Catt finally succumbed yesterday having lost it's last leaf to what I'm thinking was root rot. I bagged the entire pot and all,threw it away and sterilized the area where I had isolated it.
I've a good mind to phone the seller and complain, because she knew and sold it like that. She's from the metro area and the fair was held here on the Western side of the island.
I guess they consider us the 'country bumpkins' and sell us the bad ones X(
I was very disappointed with that fair because as I think I've written here before, I was expecting adult and/or exotic plants, and all they brought were small bare rooted plantlings and seedlings. The blooming ones were mostly for display. Okay, sorry, end of rant
So I still need a yellow Cattleya! *sigh*