What is the ruling on using bank interest to live on, for a woman who has no provider other than money in the bank, or for girls whose father abandoned them and who live on interest after their relatives abandoned them?

Placing money in an interest-based bank and receiving interest from it is forbidden usury (riba), unlawful except in cases of extreme necessity that threaten perishment or great hardship, or an urgent need that is equivalent to such necessity. Whoever inherits a deposit or places money in an interest-based bank must withdraw the money, repent to Allah, and dispose of the interest by giving it to charitable causes, unless the person is poor and in need, in which case they may take from it what suffices their need. Difficult circumstances are not considered a justification for consuming usury unless they reach the level of necessity or need equivalent to it. Now, with the existence of Islamic banks, there is no necessity to place money in interest-based banks.