Is it permissible to give zakat to a maternal aunt burdened with accumulated debts due to preparations for her daughter's marriage and other problems that led her to borrow, which she has been unable to repay?

The criterion for a debtor who qualifies for Zakat is someone who incurred debt for a permissible matter, or for an impermissible matter from which they have repented, and they are unable to repay the debt. A woman incurring debt to prepare her daughter for marriage or to repel injustice from her is a permissible matter, so it is permissible to give her from Zakat to repay her debt. The money can be handed directly to the creditors if there is concern that she might misuse it.