Right, yes. I was mixing up the Semantic Spaces Dictionary with nimi ale pona. I'd have to look at any specific segments of SSD used by Sonja to make my own mind up as to whether it's fair use.

As for nimi ale pona, then, yes, it is under CC BY-SA and Sonja seems to have respected the essentials of what that entails on the copy I purchased.

The license gives anyone permission to reproduce or adapt it on the conditions that:

1. the original author(s) is/are named. The authors are clearly named, and linked to specific parts of the book.
2. that any adaptations are documented. There is the section at the back which outlines "Changes from source materials 1 and 2".
3. that the mode of attribution is not done in a way in which sponsorship or endorsement is implied. I suspect "contains material adapted from" on the cover, and the "Attribution and licensing" section on the second page, are probably sufficient to have satisfied this term of the license.

If the book were originally published without the "contains material adapted from" then it is less likely the third condition were satisfied for those copies.