I hope my efforts are not in vain

[Kerplunq]

About a year ago I went to an orchid show with a few friends and family members. While we were looking around, my sister purchased a beautiful dark waterfall Miltonia, with what I think to be the most amazing scent ever!
Well the year has gone by and so has, what is left, of this beautiful plant. Being the big brother that I am, and b/c I wanted it and she bought the last one the vendor had, took on this very sad, and very beaten up plant.

What is left is some good roots, three small but healthy bulbs and one leaf that's trying to hang on. All the other leaves have withered off or been eaten by her cats.

So my question is, How can I resurrect this plant back to what it was? I have a great care sheet for it, but is this enough? Am I wasting my time? (I hope not)

If any experts wanna see pics to determine, please let me know. I am embarrassed at how bad this is, but hopefully I can get this back to life!