I barely remember Shari & Lambchop, but I just went and watched a couple of old videos on YouTube from performances on some old variety shows back in the 1960s.
That was a very cute act, and I think it would be a something a 9 year old girl would probably go for.
Heck, you could just take your kid to an arts & craft store and buy her enough supplies to make a whole ensemble of puppets.
Maybe show her a few Lambchop videos and see if she takes to the idea.
I just mentioned this in another thread yesterday, when my boys were toddlers, I had a sock puppet and would talk to them in an English butler voice based on Hobson from the movie, Arthur.
It was hilarious, I actually used it as a parenting tactic to teach them all kinds of stuff, from vocabulary words to good manners.
They almost always looked directly at the puppet and hardly ever at me, what a blast! I really miss them being that little.
Anyway, your 9 year old could easily practice her craft performing for smaller children if you have any in the family.
When she gets a little older, I bet she could use the puppet routine on baby sitting gigs.
She could have a lot of fun developing different characters, and then building her own sock puppets.
If she is having trouble with ideas for what to make her puppets say, suggest that she read children’s books in the puppet voice or act out the plot of the book.
Dr Seuss books are great for that, and I do believe that is how I got started doing the Hobson routine for my kids, reading them Green Eggs & Ham in a snooty English butler voice.
I think the puppet part is easy to get her started; if you can help her develop the first couple of characters, and get her a book on how to do different dialects that might be the key to having her run wild with the idea.
Good Luck!
It sounds like a lot of fun. 