I see other people agree with my opinion. I think she knows what she has. Now that you posted a pic of the plant I'm sure of one thing, Its cannabis.
What you have is an Indica dominate cannabis plant that has been pruned to keep short.
No, you dont dry and smoke the leaf. You change the amount of light it gets to 12 hours a day and it creates flowers. You dry and smoke those.
Maybe someone else slipped her the seed as a joke IDK
How about this, start a conversation and ask her if she ever smoked weed when she was younger. Get her reaction. Be honest, tell her what you think.
Or, take the thing, tell her it died and go plant it up in the hills. Come fall you may just have what you want.