New Idea magazine reports that Glassop had been unsuccessfully trying to get in touch with granddaughter Tiger Lily through guardian Sir Bob Geldof for the past couple of years.
Tiger Lily was adopted by Geldof after the death of Hutchence in 1997 and mother Paula Yates in 2000 so that she could be raised with her half-sisters.
Glassop has previously said of Geldof: "I've begged and pleaded with him to let me see Tiger Lily again, but he's turned a deaf ear. He's treated me shabbily."
Hutchence's brother Rhett announced his mother's death on the internet, saying: "She looked beautiful and I was happy to have been there for her. Thank you for all your kind words and wishes."