How can I repair a warped fiberglass Tiffany lamp?
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https://www.pinterest.com/pin/388576274074413592/
I don't know if this will help but perhaps:
https://www.hometalk.com/diy/decorate/rooms/q-repairing-a-tiffany-type-lamp-20602402#!
https://www.hometalk.com/diy/decorate/rooms/q-what-glue-do-you-use-to-fix-tiffany-glass-lamp--20770571#!
https://makezine.com/2012/12/21/how-to-repair-a-separated-tiffany-style-lampshade/
Repairing a Tiffany type lamp
What glue do you use to fix a Tiffany glass lamp?
Not much to do to unwarp fiberglass. Sorry.
It sounds like it got too hot.
Perhaps a hot hairdryer and working the warp out of it with a metal spoon?