Saw your answer again by chance - - I often think of Lori Beth Denberg shouting as that librarian in those skits -- "Be QUIET!!! This is a LIBRARY!!" :)
LOL... I always thought it was funny how she (Lori Beth) was always cast as either the mother, the teacher, the librarian or some other older matriarchal figure. Oh, and by the way, the catch phrase was actually, "QUIET!!! THIS IS A LYE-BERRY!!!" The "R" was deliberately omitted for a much more humorous effect... and it worked!!! :))
You're right, bevo, you're right! The exact quote you wrote came back immediately to me once I read it! :) She did get those type of roles, yes. I loved her comedic timing in whatever role/skit she was in -- very funny! :)