Here is a letter that was printed in Lois Lane #115 (1975):
Bitch, calm down. First of all, she's a fictional character so any answer to the question "What happened?" is going to sound crazy. And secondly, let's have a look at this allegedly "bulky" and "sometimes even fat" heroine (from Lois Lane #111).
Thorn is so fat, she has to iron her clothes in the driveway! When she jumps she gets stuck!
This art was drawn by Gray Morrow and it is BEAUTIFUL. Are you kidding me? She looks totally foxy. She just looks real.
For the record, this is what Thorn usually looked like: