Armstrong made her screen debut as Minnie May Barry in the TV series
Anne with an E from 2017 to 2019. At the age of eight, she made her film debut in the drama film
The Art of Racing in the Rain, starring
Kevin Costner,
Milo Ventimiglia,
Amanda Seyfried and
Gary Cole. In 2022, Armstrong played the title character in
Firestarter. She was nominated for the
Golden Raspberry Award for Worst Actress at the
43rd Golden Raspberry Awards, but public backlash due to her being 12 at the time led to the nomination being withdrawn, an apology from the Razzies, and a rule change banning minors from being nominated.'''''' In 2024, Armstrong played the role of Fern in the
Disney+ science-fiction television series
Star Wars: Skeleton Crew. In May 2025, Armstrong was cast as the lead in the
Buffy the Vampire Slayer reboot at
Hulu. On March 14, 2026, it was announced that Hulu decided to pass on the pilot. ==Filmography==