What is the religious ruling on a sister remaining at her workplace far from her residence, with no available transportation, if the work is essential for her, is her sole source of income, and is located near her family's home?

An 'iddah-observing woman is not permitted to move from her deceased husband's house until her 'iddah period has concluded, or until she gives birth if she is pregnant. However, she is allowed to move if there is an overriding necessity, such as fear for her life, property, or honor, or the cessation of her livelihood, or the unavailability of essential needs, or the absence of someone to transport her to her work, which is her sole source of income.