Do you mean "parental alienation?" Alienation of affection suits are when you sue the AP for interfering in the marriage and is allowed by only seven states currently.
If your child is 18 or over, I'm not sure if parental alienation would apply or be considered by the courts, since your daughter is technically, legally an adult. Can you ask your attorney or check the laws of your state? I think it would depend on the state. I'm sorry you're having to deal with that, parental alienation is a horrible thing for the other parent to endure no matter the age of the children and even if they're adults.
