Her filmed television credits include guest star roles on most of the major shows that were running during the late 1950s and throughout the 1960s, including Stagecoach West, Father Knows Best, My Three Sons, The Americans, Gunsmoke, Bonanza, The Virginian, Arrest and Trial, 77 Sunset Strip, Rawhide, Tales of Wells Fargo, Wagon Train, Laramie, Route 66, Hawaiian Eye, The Rifleman, Thriller, Maverick (in the episode "Dodge City or Bust" with Jack Kelly), The Life and Legend of Wyatt Earp, Dobie Gillis, The Westerner, Perry Mason, and The Man from U.N.C.L.E.. Millay made three television pilots for prospective new television series, Slezak and Son, Boston Terrier, and Las Vegas Beat.