Wa `alaykum As-Salamu wa Rahmatullahi wa Barakatuh
In the Name of Allah, the All-Merciful, the Mercy-Giving
All praise is due to Allah. Peace and blessings be upon His Messenger Muhammad.
90% of the cases that come to me like that we manage to have the person accept Islam Hamdulillah. In most cases, when the girl or any family member talks to them, people might not be receptive as it comes with authority and the tone of demand and fear at the same time. Imams might be better presenters of Islam in such cases.
My advice is to meet an Imam and talk to him and see where it goes from there.
As for the marriage of a Muslim girl from a non-Muslim, it is a major sin in Islam and you should not be of approval of it. If she insists on doing it she is to be liable in front of God about such a sin.
I am also at the same time not to disconnect totally from any family member regardless of their level of sin. There is a lot of fitna out there and we must try our best to the most we can provide guidance to people, the rest is up to the person to decide.
Almighty Allah knows best.
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