I had no idea Estelle was her closest friend on GG. I thought it was Betty. I guess she got closer to Betty after Estelle lost her memory completely. She also mentioned that all four of them were on Vicki Lawrence's tv show. The show ran from 1992 to 1994, so I guess they were there in 1992. If someone has a video of them on her show, please share it.
The interview starts at 12:53 and there's no blooper.