PLEASE help me!!!
Break off a piece and knead it, the warmth of your hands should soften it up. If it wo't come together you can try to add a little shortening to it while you knead it.
I'm sure it's too late for your emergency. However, Lauren Kitchens did 2 youtube videos on "how to" and "how NOT to" make modeling chocolate... Which may help with the diagnosis, so to speak.
I'm not sure if I can link straight to youtube... You can find it in google, just try; lauren kitchens modeling chocolate youtube.
Hope this helps.