My plan is to gauge their interests and go from there, but I do think something that encompasses some form of easily observable results/progress is important.
Processing[1] is a Java-like programming language and environment which makes it easy to write games and digital art. Good performance, excellent documentation, a lean but powerful standard library, and skills that are transferrable to many other "mainstream" languages.
If you're working with a very small group, try to build your curriculum around their interests. Do they enjoy storytelling? Perhaps you could introduce interactive fiction and build some text-based adventure games. Computers can also be used for music, drawing, composing poetry, and so on. The classic "Twenty Things to Do with a Computer"[2] still offers many good ideas.
[0] https://www.csunplugged.org/en/
[2] https://www.researchgate.net/publication/37596692_Twenty_Thi...
How many hours per week?
Python with the turtle package looks like a nice starting point. I didn't use it, but I programmed in Logo when I was young. Some link found in Google https://www.geeksforgeeks.org/draw-square-and-rectangle-in-t...
When she grows up, she can abandon syntax, and use all the parenthesis she saved while she was young.
Also, don't underestimate Excel. It's very powerful and you can do a lot of interesting things. For example, I like recursive defined sequences, like A2=(1+A1)/2, A3=(1+A2)/2, A3=(1+A2)/2, ... ?
https://m.youtube.com/playlist?list=PL8dPuuaLjXtNlUrzyH5r6jN...