Is it obligatory to dispose of previously acquired bank interest by giving it to the poor, and keeping only the principal, then depositing it in a current account in an Islamic bank, or should it be deposited in an account with no interest whatsoever, bearing in mind that leaving the job may not provide an alternative source of income?

The interest-based benefits paid by banks to depositors are explicit usury (riba) and unanimously forbidden. This money must be withdrawn, and the interest disposed of by spending it on the interests of Muslims or on the poor. The principal capital can be invested in Islamic banks that adhere to Sharia (definition) principles. There is no harm in a woman continuing to work if the Sharia guidelines are met, especially if she is in need of it to support herself.