Marie has some potential for science, which means the Daughters would want her on their side instead of independent. If you're allied with the daughters, you can arrange to have Marie join them voluntarily (which requires talking to Marie (to make her understand that the Daughters will train her as well as Teacher could) and possibly her father, or kidnap her and deliver her into their custody. Either way, it requires talking to Merrin, and afterwards Marie won't be in the Blackfoot town any more, which will ensadden the Hangdogs and especially her father.
Merrin would be interested in getting Marie to join the Daughters of Hecate, but fears it may make the tribals angry if Marie doesn't suggest it herself.
I knocked out Marie and took her to Merrin, who left town to take the girl to the headquarters of the Daughters of Hecate.
I drugged Marie and took her to Merrin, who left town to take the girl to the headquarters of the Daughters of Hecate.
Talked to Marie about the Daughters of Hecate and convinced her that she would be better off with the Daughters, since they could teach her medicine and give her an important job somewhere with another tribe.