Pretty, struggling, personality-free lyricist in a nameless big city from the "Words, Music and Love" story in romance comic book Love Diary #38 (July 1965).
She gets her big break when successful songwriter Rex Engels taps her to be his new partner. They hit it off musically and romantically. But then they run into Rex's ex, singer Rena Bane, who coaxes Rex and drags Karen into writing some new songs for her. When Rex spends time with Rena to go over the songs, Karen thinks she's lost Rex to her.