Sounds like a re-write of history, which Wikipedia does a lot of. She did not say so, in the book which was written about her, with her assistance.
If she was "assimilated", they were willing to give her up.
In most Indian tribes, women were mere chattel.
Here is a different version. It is clear, she was better treated by the Mohave, than by her original captors.
I read the book about her, written a few years after she was rescued. As I recall, she was treated as a slave by the Mohaves, and was mostly on the edge of starvation. Her sister died of starvation. The Indians who killed most of her family were said to consist of outcasts of an several other tribes.
As I recall, she was 19 when she was rescued. She died in 1903.
For some of the captive girls who grew up in the tribes, capture was more like kidnapping. They did not want to leave their people who were no longer the civilized white folks. Cynthia Ann Parker had some trouble regaining English when she was recaptured. She did not go back but she lived a miserable life after.