Is it permissible for a mother to communicate with her daughter who has abandoned the hijab and prayer, deviated from the religion, and openly practices immorality, or must she disown her?

It is permissible to communicate with this girl to advise her and try to bring her back to her senses and her religion. The advice should be given with wisdom, reminding her of the seriousness of her condition and the grave consequences if she dies upon it. Moreover, one should supplicate extensively for her guidance and repentance, because the supplication of parents is answered. Her guardian must assume responsibility for bringing her back to the truth.