All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger. We ask Allaah to exalt his mention as well as that of his family and all his companions.
It is not permissible for you to ask Allaah that this woman and her husband be divorced; if you do so, you are sinful, as this is supplicating with sin. By continuing this relationship with this woman, you are spoiling her relationship with her husband. It is confirmed that the Prophet said: “He who spoils the relationship between a woman and her husband is not one of us." [Abu Daawood]. Therefore, you are obliged to repent and cut this relationship with this woman as it is not permissible for a Muslim man to establish an affectionate relationship with a marriageable woman even if she is not married; if she is married, then this is even more forbidden.
The pious and righteous people should endeavour as much as possible to reconcile between this woman and her husband. Then if reconciliation is achieved, all perfect praise be to Allaah, otherwise they could be divorced with kindness, as it is permissible for this woman, since she hates her husband and fears to be negligent about his rights on her, to take the matter to an Islamic court so that the harm will be removed from her (i.e. obtain a divorce for her).
Finally, the following matters should be mentioned:
1- In principle a Muslim is innocent, so it is not permissible to accuse the family of the husband with magic without evidence.
2- If we presume that divorce takes place, there is no harm on you to marry this divorced woman, however, it is not permissible for you to endeavour to spoil the relationship between her and her husband.
3- It is not permissible for a guardian to oblige his virgin daughter to marry someone she does not like, according to the view of the majority of the scholars. So, if he obliges her, she has the right either to continue and accept the marriage or invalidate it.
Allaah Knows best.