Is it permissible to give Zakat money to a sister who is indebted to me and has not repaid what she borrowed, knowing that she is paying installments for a house?

It is permissible to give the poor or needy sister from zakat money, especially if she does not have a husband to support her. This combines charity with maintaining kinship ties. It is also permissible to give her zakat to pay off a debt if she cannot find a way to repay it, and she is not obligated to sell her home to pay off the debt if she owns it to the extent of her needs, for owning a home does not remove her from the state of neediness.