What is the ruling on eating food from the earnings of a working mother in government circles who does not adhere to the Islamic dress code and mixes with men? And how should Muslim employees who use government transportation be dealt with?

You must be gentle with your mother when advising her about the obligation of adhering to the full, modest Islamic veil (hijab (definition)) and abandoning unlawful mixing (ikhtilat), while still showing her dutifulness and obedience in matters that do not involve disobedience [to Allah]. Her money is lawful, and it is permissible to eat from it if her work is permissible and does not contradict Islamic law.