Should I propose to the girl a second time after recovering from sorcery, given her previous rejection of me?

If the person you approached is a sorcerer, then you have committed a great sin and transgression, for sorcery is a gateway to disbelief, and its perpetrator falls under a severe warning. However, if he is a Sheikh who performs Ruqyah according to Islamic law, then there is no harm in seeking his help to undo sorcery.

Regarding your question about marriage, a woman is married for four reasons: her wealth, her beauty, her lineage, and her religion. The best of them is the one who is religious, as the Prophet, peace and blessings be upon him, said: "Marry the religious woman, and may your hands be blessed."

If these qualities are found in the girl, then there is no harm in marrying her, along with performing Istikhara and consulting righteous people.