My poor Phalaenopsis

[OrchidLove]

Hello All!
I was given a gorgeous Phalaenopsis for admins day and when it started to turn yellow I repotted it only to find that I had root rot and that the plant had been arranged with Styrofoam popcorn on the bottom. Since I’m a beginner and I panicked I cut off a good 90% of the root and repotted it in a mixture of soil and chips. I moved it to a warmer place where it dose not get direct sunlight and stopped watering it as often. Despite my efforts to save the plant all the flowers have fallen off, the stick (sorry Im not familiar with the Orchid anatomy yet) is turning a yellowish color and I am down to my last leaf which is now truning yellow as well. Is there any hope for my baby?
Also, If anyone knows where I can find a diagram of an orchid so that I can familiarize myself with the plans parts.

Thanks a million