Can I get French dual citizenship?
From your brief discussion, it sounds like your mother may have been born with dual citizenship. Dual citizenship is not something that you apply for, it is something that you just have. However, someone who has dual citizenship can surrender one of their citizenships. Because of the possibility that your mother may have surrendered her French citizenship, I can’t tell from your question whether or not your mother still has dual citizenship or had dual citizenship when you were born. If your mother was still a French citizen when you were born, you might be a French Citizen. I would contact the closest French Embassy or Consulate to check whether or not you qualify as a French citizen. If you are born a citizen of a country, you do not need to pass any fluency test to remain a citizen.