Thanks for the suggestion, Asiel.
Before reading this I went into the kitchen and slowly pulled the lid up. It came off completely! Nothing left behind. There is a slight outline on the glass of where the plastic was, but NO plastic is on the glass. Whew!! I guess it didn't melt too much so it hardened up enough to come right off. Thank goodness! I didn't want to have to smell plastic every time we used the stove for the next few months.
At my parents house we had the electric burners and we'd just turn on the exhaust fan, turn the burner on HI and burn them off. That's not the case with the glass tops.
But now I have ideas for future (which there better not be) reference. I'm just so lucky it wasn't worse. There was other things on the stove at the time too....scissors, plastic packaging from a new flashlight and batteries!!!
I guess this is a lesson for both of us..........DO NOT LEAVE THINGS ON THE STOVE!!!!!!!!!!!