Just wondering how your creeper is doing. Sorry, I can't give you any advice. Maybe something or other ate the roots? Have you checked?
Ingrid

I have two rangoon creepers in pots that I grew from seed last year. I noticed that they are sensitive to the heat and wilt mid day time. Usually, they are fine the next morning. I have no idea if your plant will come back to life. With mine being in active growth, I'd think that yours would have started growing leaves by now. Maybe scratch the woody part and see if it's green? Sometimes you can tell if a plant is alive that way.

I hope that helps somewhat!