Is it permissible to give a sister a portion of the Zakat al-Mal (obligatory charity on wealth) to return stolen money to its owners, especially since she has repented, is married, and has no personal source of income?

Stolen money is a debt owed by the thief that must be returned to its owners. If the stolen item itself cannot be returned, then its equivalent or value must be returned. If the female thief is unable to return it, it is permissible to give her from Zakat to settle this debt.