How can one deal with the desire to marry a girl with a complex past, after an illicit relationship with her, and in light of the family's rejection on the pretext of sorcery and bad reputation, and can a happy marital life be built with doubts about the past?

Magic is a reality that is treated with legal ruqyah without resorting to sorcerers. It appears that the woman who was brought to treat the magic is not a legitimate raqiya due to her use of lead. The girl must repent from her sins, and if her repentance is sincere, then marriage to her is permissible. If the parents object to marrying her, try to convince them of her repentance and improved state. If they are not convinced, then obedience to parents takes precedence.