With my older daughter I used Clasic Visual Basic 6. It's very easy to make small programs with a silly UI that does something. And also make some graphics. I liked Logo when I was a child. If your favorite program haas a turtle odule, I recomend to use it. (Later she switched to C, Python, a litle of R, C#.)

Probably Python is a good first language. I think it has a turtle module, but I'm not sure. https://docs.python.org/3/library/turtle.html looks good.

In may cases, I gave her a simple working program and made het tweak it, until she could write her ow programs.

(I also recomend to teach Excel. Used correctly, it's very powerful for simple math task.)