Is the money taken from the deceased father considered unlawful for his daughter who was caring for him? And is she obliged to return what she took from him, knowing that she took 8,0 pounds from him (5,0 for her expenses and 3,0 as a loan to her husband), in addition to 200 pounds monthly and transportation costs, with her inability to repay currently?

The Sharia commanded justice among children and forbade preferring some over others in gifts. The predominant view is that justice is obligatory by giving the male the same as the female. However, it is permissible to prefer some children in giving if their needs necessitate it, and not out of preference or favoritism, such as if one is in need, or has a large family, or is a student of knowledge, or to withhold a gift from a transgressor or an innovator. As long as the father gave you the money due to your need, there is no sin upon him or upon you, and you may benefit from it, and you are not obliged to return it to your siblings.