*Hi mitnateket me'ha-mishpacha
I= ee sound (as in beet) in IPA (international phonetic alphabet).
you need the hitpael form of נ-ת-ק because it is a reflexive verb so it must be מתנתקת
"היא מנתקת את עצמה מהמשפחה" לא חוקי?
I am just a Hebrew learner but as far as I understood 1. Hitpael is (mostly) reflexive, thus "herself" is included 2. A hitpael verb can't have a direct object