It's true...It have to be a really early Harley Quinn...before she got known as Harley Quinn. I took the screenshot from Batman 1966 TV series episode 5: The Joker is wild. In this episode, and episode 6: Batman is riled, you see this woman, with the Joker. And he is even calling her Queenie(sound like Quinny), briefly, in episode 5. Okay she's even more of a dimwhit than she is now, 1966 remember?, but still.
I don't know if she survive further (I only just started to watch the 1966 TV series) but still...
I used this place [link]
Harley Quinn...er...Queenie...is played by Nancy Kovack