"Prendriatz ma maladia" meaning "you'd get a taste of my evil character" is very far-fetched IMO.
I've always thought she was healthy and that the disease was just a trick to be left alone (I don't trust knights offering to cross a wood just out of chivalrous spirit, you see!) but I could be wrong. It doesn't seem to be some piece of "trobar clus", it's some "trobar lèu" with very simple syntax and vocabulary, I take it to mean just what it seems to mean.