I finally made this connection between these two scenes
S01E10 - Pier Pressure
[Lucille is going through an old jewelry box with Maeby, reminiscing on how they were acquired]
Lucille: And this is from when your Pop-Pop yelled out, "Oh, Melanie" when he was making love to Gangy.
Maeby: This is so much fun. I can't believe my mom thought being here would be a punishment.
Lucille: Oh, she thinks I'm too critical. That's another fault of hers. Ah, yes. The week we had the au pair. You know, your mother always wanted this brooch.
Maeby: Really?
Lucille: Do you want it?
Maeby: I do now. That'll show her for trying to punish me.
Lucille: Oh. Pretty. It'll distract from the freckles.
[a couple scenes later, Lindsay arrives]
Lindsay: So, having fun? Where'd you get that brooch?
Maeby: Gangy. Nice, huh?
Lindsay: That was supposed to be for me. She was my au pair. I'm the one who cleared my throat and pointed to the laundry room. Ma! You know I wanted that.
Lucille: I know, but it's an elephant and I didn't want to invite the comparison.