][5] Bromley began her career in the early 1930s on contract with Monogram Pictures, she was first billed as Sheila LeGay starring in 1930 westerns alongside Tom Tyler.

She frequently co-starred with Ken Maynard, Hoot Gibson, Johnny Mack Brown, Bill Cody, and Dick Foran.

Bromley appeared uncredited in the Marx Brothers film Horse Feathers (1932) where she delivered the famous line "The Dean is furious!

She made five guest appearances on Perry Mason during the series' nine-year run on CBS.

Bromley retired from films in the 1970s and lived in the Greater Los Angeles Area until her death.