What is the ruling concerning the money the questioner received from a government office in exchange for work she did not perform at her brother's bakery, and how should she deal with the amount she spent and the portion with which she bought gold, especially given that the bakery has closed down?

It is necessary to go to those in charge of the office and inform them of what happened. If they request the return of the amount, it is obligatory to return it. If they forgive it, then there is no issue, provided that the one who forgives has the authority to do so. If they do not forgive and do not accept the amount, then it should be given as charity to those in need, along with repentance, remorse, and seeking forgiveness.