What is the ruling on a girl marrying using money her father borrowed from a usurious bank because he could not bear the costs of the wedding, and is it better to postpone the marriage for work?

Your father is not permitted to borrow with interest (riba). He must sincerely repent by expediting the repayment if the interest can be waived. The prohibition of the loan pertains to his responsibility, not to the money itself. So, if he spends from it on your marriage, there is no sin upon you. As long as he insists, do not disobey his command, in accordance with His, the Almighty’s, saying: "And We have enjoined upon man [care] for his parents – good treatment" (Al-Ahqaf: 15), and "And accompany them in [this] world with appropriate kindness" (Luqman: 15). Righteousness towards parents is among the most beloved deeds to Allah after prayer at its appointed time.