Located it

The Sixteen-Millimeter Shrine" (Season 1, Episode 4), which originally aired on October 23, 1959. It stars Ida Lupino as Barbara Jean Trenton, a faded 1930s Hollywood actress who lives in the past by obsessively watching her old films.

Key Details of "The Sixteen-Millimeter Shrine":
Plot: Unable to accept aging and her faded fame, Barbara refuses to take modern "mother" roles.
Escapism: She spends all her time in her projection room, surrounded by stills of her younger self.
Ending: She escapes into her own movies, physically entering a world where she is young and beloved forever.

Theme: The episode, written by Rod Serling, focuses on the dangers of living in the past rather than facing reality.


Another episode featuring time travel to the past is "No Time Like the Past," but "The Sixteen-Millimeter Shrine" perfectly fits the Hollywood actress scenario.