What is the ruling on marrying a girl whose father works in the alcohol trade, and is it permissible to take money from this father, knowing that the girl herself has financial dealings with her father?

Islamic law does not condone a relationship between a man and a woman before marriage, even if it is with the intention of marriage.

Regarding your marriage to this woman, if she is a woman of faith, her father's trade in alcoholic beverages does not harm her, based on the saying of the Messenger of Allah (peace and blessings be upon him): "A woman is married for four reasons: for her wealth, for her lineage, for her beauty, and for her religion. So choose the one who is religious, and you will prosper." And also based on the words of Allah Almighty: "And no bearer of burdens will bear the burden of another."

However, if her father's entire income comes from illicit earnings, it is not permissible to benefit from it. But if his wealth is mixed, spending from it is permissible, though disliked.

As for the loan the woman gave her father, there is no harm in her reclaiming it from him, unless he pays it to her from the very essence of ill-gotten money.