Oh, that's right.
She found a newspaper article about big, tall, glasses-wearing Gloria Little's wedding to her six-foot-tall husband (Mr. Calvery) which mentioned that William Shelley was best man.
On September 17th 2015 on the "Who Saw Baker Enter The TSBD" thread, Linda proposed the ID for Gloria on Elm Street.
This is the pic from that post:

If I remember rightly she was way ahead of everyone in making the ID.