Apparently, Inside Edition interviewed them, this is what they had to say:

Bea "Dorothy" Arthur, told the show she's been grieving for years over Getty's long decline due to dementia, and could not deal with the emotion of a funeral: "She's been out of it so many years, not recognizing anyone. It's a Godsend. She's at peace."

Rue "Blanche" McClanahan, said that she couldn't attend the funeral because she recently had surgery: "I'd like them to know that I didn't [attend the funeral] because I can't fly right now with knee surgery. I don't know why Betty and Bea didn't go, maybe because they, too, have said their goodbyes to her when she was alive."

The show did not speak with Betty White, but they learned that she sent a bouquet of flowers with a card that read, "Love, Betty White." In quotes she added the name of her character on the show, "Rose."

So that's their reasons.

HMMM! I know they were all very close and kept in touch after the show ended. I can understand the reasons though and it'a always easier to remember someone at their finest. I will always remember

Picture It! Sicilly.....

Sad She was such a talent!!

This still makes me sad. I love that show and I always will. Estelle had such a great talent. It doesn't feel like she's gone, and thanks to Sophia Petrillo, she never will be.