phal with purple and wrinkly leaves

[chelsw]

Hi my name is Chelsea. This is my first post but I love orchids and I have 3 of them, two are very healthy and one I'm just not sure about. A few months ago It started losing leaves rapidly, and the new leaves it put out are about 1/4 the size of the previous healthy leaves.
I knew something was wrong, so I pulled it out of its pot and it had root rot pretty bad. I think it was in too large of a contianer, I cleaned him up and got rid of all the dead roots (there were still some healthy ones). I re potted it in a much smaller container and it has put out one new leaf since then. I use an orchid potting blend of bark. I re potted it over 2 months ago and at first the new leaf grew very strong and very green. But it got to the size shown in the pictures that are attached and has just shriveled from there. (my sister's cat taking a bite into one of leaves didn't help it either)

I water them once a week alternating from just a few ice cubes to running water through them every other week. I fertilize them about once a month and I just don't see any progress on this plant. Any suggestions someone has for how to make it healthy again would be greatly appreciated!!
Thank you!