https://i.imgur.com/IorqINJ.jpg
(from S03E14 - Tell it to the Marines)

I haven't seen a lot of Happy Days, but I'm watching Season 3 and this girl and a couple others are often in the background at Arnolds or hanging around the Fonz, but they never have any speaking parts (at least so far).

Anyone know who she is? I can't find a cast list of all the extras.

A couple other shots from other episodes:
S03E19 - Two Angry Men (https://i.imgur.com/niBVx0p.jpg) (right-hand side, standing with blue hat)
S03E20 - Beauty Contest (https://i.imgur.com/6dPtr6h.jpg) (sitting on far right, brown dress)