Audiences had a particular image of June Lockhart thanks to "Lassie" and "Lost in Space," but was she really like the caring, maternal figure from those shows?

June Lockhart died at 100 of natural causes at her Santa Monica home. She married Dr John F Maloney in 1951, had two daughters, and divorced in 1959, later briefly marrying architect John Lindsay. She is survived by her daughter June Elizabeth and granddaughter Christianna.

“She loved rock ‘n’ roll,” Mumy, 71, previously told Fox News Digital. “She brought The Allman Brothers to the studio when they were in a group called Hour Glass. She took me and Angela Cartwright to the Whiskey a Go Go. She got us tickets to see Simon & Garfunkel. June is truly a rock ‘n’ roll gal.”

The Vandalia, Illinois, native has no plans to slow down anytime soon. June stars as the title character in Eleanor the Great, Scarlett Johansson’s directorial debut, which hits theaters September 26. “She was great,” June says of working with Scarlett.

Squibb spoke to PEOPLE exclusively at the star-studded Academy Museum Gala at the Academy Museum of Motion Pictures in L.A. on Oct. 18. During the conversation, the actress spoke about the way she has seen the industry evolve in her lifetime, especially in relation to women and ageism.