She is a graduate of South Side High School and completed her Bachelor of Science in Physical Education at Hofstra University and Springfield College, having earned both academic and athletic scholarships.

[1][2] Gillett began her professional career playing for Watford before moving up to Brighton & Hove Albion.

[4] Gillett is a vocal supporter of increasing awareness of issues in women's football, having been the target of sexist abuse on the field.

On 12 January 2020 at an away match against Coventry United Ladies at Butts Park Arena, Gillett reported to the referee after the first half that a group of men standing behind her goal made several verbally abusive and sexist comments, including shouting that the referee ought to confirm the gender of various players.

"[7] The event prompted Gillett's former manager Hope Powell to respond, "There need to be proper sanctions in place to stop these people coming and supporting the game that everybody loves."