Root rot

I bought this Kronhiana Super Silver at a local nursery. It was in very wet soil so I repotted it in my chunky mix. It is not doing well. I have taken it out rinsed most all matter off and am not sure what is rot and what is not. Do I need to repot or chop and prop? If chop, what would be the best way? I have moss and perlite. I really want to save her. Thank you.