Do your characters have any Aspects with respect to a legal approach? Would the child and the characters acting as her guardians not have proper documentation? Would the characters not have covered the legal aspect in the first place or made it much much more difficult?
Yes... maybe and it's complicated. We already had the custody question playing out in the background, involving legal claims and issues from two different states.
You see, the mother (cultist) tended to regard the kid primarily as property to be dedicated, sold or sacrificed as she chose. The father [listed on the birth certificate as unknown] was a Changeling who when he discovered this, managed to steal the child away through the Nevernever at the cost of his life.
The result was that the girl was found in New Mexico apparently abandoned, no known identity (and no matches on missing children databases) and showing signs of abuse/neglect. She became a ward of the state and Betty, the doctor PC, became her foster mother and legal guardian.
Since then, the mother has come forward claiming custody working through the court system in her home state as well as behind the scenes with cultist minions lurking in the bushes. Betty has hired both a lawyer and a PI. She has also been is taking the child to a therapist and working closely with Social Services – in short doing everything right to advance her petition to adopt.
Now, we get to add the evil law firm and whole media circus – although I doubt Betty would consent to appear on television. Still, that won’t stop nosy reporters from ambushing her outside the court, or at work or possibly even at her home.