She might consider buying Poser 11, if cost is an issue.

https://www.renderosity.com/rr/mod/bcs/poser-11-for-windows-and-mac/112656/

There's really not a huge difference between them, particularly for a kid. Poser 11 is probably easier, since the Simple version of the Material Room has been removed from Poser 12.

Plus, Poser 12 is still in beta, and can be frustrating, when they fix one thing but break another.

And there's upgrade pricing, if she does want to move to Poser 12 in the future.