text: if she's looking to take custody, thereby taking away your mother's rights, she cannot. your mother does need an attorney tho. if she's looking for gaurdianship in terms of emerency contact, your mother still needs to set that up. your mother still needs an attorney. your sister would have to prove that your mother is a danger. since your mother cannot come back because of her status, she needs to contact the French government and talk to the US embassy there.