How can the amount of money the plaintiff lost, which belonged to her father, be compensated, given her lack of financial resources, her husband's refusal to compensate her, and the embarrassment this causes her with her family?

You are not obligated to return the money if it was lost without negligence in its safekeeping, because it was a trust with you, and a trust is not guaranteed except through negligence in its preservation, based on the Prophet's (peace be upon him) saying: "There is no guarantee upon the trustee."

The trustee is volunteering to safeguard the trust, and if he were held liable for it, people would refrain from accepting deposits. Your husband is also not obligated to return the money, even more so. You should explain what happened to your family, and if your husband volunteers to return it to your father, that would be an act of kindness.