Did the disposer of her deceased aunt's money sin, and is she required to return the money, and to whom would it go, knowing that the deceased has three full brothers and three full sisters?

The estate of the deceased, who left behind three brothers and three sisters, is to be divided into nine shares, with the male receiving the equivalent of two females' shares. As for the money given by the maternal aunt to the questioner: if it was a deposit, it is considered part of the inheritance for the heirs, and the questioner must pay it to them and guarantee whatever she spent from it without their permission. However, if the questioner claims it was a gift, she must prove this with evidence; otherwise, she is obliged to pay it to the heirs and guarantee whatever she spent.