I like your 1 digit PAO. It’s well designed with your persons/objects and its actions. It would work well for your daughter with a little training and hands on practice.
I have already done a 1 digit system but with number shapes instead.
You can download it here to get some more ideas.
The one you’d need to download is the Starter Version of the shaper which is created for the younger ones.
Hope this helps to give you some more ideas to use with your system.