She didn't show up until the 3rd season, I think. Only the 1st season was ever released on DVD and since fans wanted the Markie Post episodes, nobody bought the 1st season. I guess the sales were so bad they didn't bother releasing the rest of the show, except for a "best of" collection that also didn't do well. I miss Roz too.
Early intro reminds me of how funny Selma Diamond was, and how much the show went downhill after that - until John Astin and Shelley Berman briefly saved it by being crazy.
Hey diddle diddle
The cat and the fiddle
was a lie like all the rest
The astronauts killed the man in the moon
Growing up took care of the rest.