Janet,
Silicone or plastic?
If its plastic, you could try freezing the mess and see if you can then pop it out of the mold. If its a silicone mold, its probably toast.
I dont know of an easy way to get the flower out of the mold. You could maybe try sanding it down (depending on how gooey it is) leaving a margin on all sides. Get it shiny again, they cast it as a finding into your next resin casting.
Good luck!