Over invasive grandmother?

The other day, my Director pulled me aside and cast me as a grandmother in a production she needed another actress for. This role is your typical over invasive, obnoxious, loud, baby-obsessed grandmother. If it helps in answering, we're doing "Baby" by Conrad E. Davidson from Samuel French Inc. I was think of characters like "Seinfeld's" George Costanza's mother (Estelle), but I can't seem to pull off the voice. I've looked at characters from the Golden Girls, but still nothing. She gave me the role Friday and we have a preview this Monday, so I really need to self-teach and quickly. All my lines are pretty much me fawning over this baby, and I'm really just looking for good websites or videos to help me nail this character. It's a pretty stock-character role, so it's surprising me that I can't find more on it. Anyway, thank you for your help!