Sooo, Penny teaches Missy how to dress, apply makeup, flirt with boys, etc.?

Well, she has guest-starred in a way, as the voice of the swimming pool...

@Joneszy said:

She should come on the show as Mary's younger sister to help out after the dad dies. George Sr. could stay on as a ghost whenever Mary needs to talk with him. It could explain why Sheldon took so easily to Penny because she reminded him of his aunt. Penny is already a mix between sister Missy and Meemaw Connie.

I’m thinking, this is probably as close as we’re ever going to get. Even so, one can still because you never know!

BY-THE-BY: Thanks for this clip .