What is the ruling regarding a divorced wife who mistreats her ex-husband and prevents her children from visiting him, despite having received all her financial rights and the husband having relinquished his home to her?

Allah does not like the open utterance of evil speech, except by one who has been wronged. Even the wronged person should not utter it openly except to someone who can grant him justice. This woman must fear Allah and refrain from cursing, reviling, backbiting, and severing ties of kinship, for these are grave sins. She must seek refuge with Allah from Satan and ask Allah to purify her heart from malice and hatred towards this man, for what she is doing will only harm her. Since he treated her well and feared Allah in his dealings with her, she should fear Allah concerning him and be content with what Allah has allotted her.