Nothing is known about how close the Runaways movie is to production - but the latest revelation suggests Marvel has begun casting.
According to website Allthingsfangirl, the programme for a US theatre production of How I Learned to Drive, in which Grant stars, reveals that she is in line to star in the comic book film about super-powered teenagers on the run from their villainous parents.
It read: "Grant can be seen opposite Michael Shannon in the upcoming Marvel Studios film, Runaways."
If true, 15-year-old Grant could play the role of Gert in the Marvel movie.
Some reports have claimed that the programme-maker might have confused the comic adaptation with upcoming band bio pic, The Runaways, which Shannon stars in. However, Grant is not noted on any cast list for that film.