My mother does not approve of me fasting every Monday and Thursday, so if I fast without my parents' approval, is there a sin on me?

Question:
She says: I am a girl to whom Allah has granted guidance several years ago, and I have started adhering to voluntary acts of worship and voluntary fasting. However, my mother does not approve of me fasting every Monday and Thursday, and she gets angry with me if I do so. She tells me that I am sick and that fasting causes me fatigue. I have heard that a married woman is not permitted to fast voluntarily without her husband's permission. So, is it obligatory for me to also take permission from my parents when I fast? And if I fast without their approval, is there a sin on me? May Allah reward you with good.

Answer:
If fasting interferes with your dutifulness to your parents and serving them, then there is no doubt that leaving off fasting and serving your parents and being dutiful to them is more obligatory. However, if fasting does not affect your dutifulness to your parents and attending to their needs, there is no harm in your fasting. But you must please them and explain that you want the reward and that this does not burden you or harm your health, because they may assume that it is harmful to you. So explain to them that there is no harm to you in it, that you are strong, and that fasting does not affect you, and that you want the reward and the recompense. Yes.