13 year old wants to add an extra 'a' to her name, for numerology, like her friend did

Her friend's mother had the friend's name 'corrected' with an extra letter on a numerologist's advice, and now my daughter wants the same. Not legally, just on notebooks, on her profile, and 'when I sign things'. I teach, and I'm already picturing every register and certificate with two spellings 😂 Board registration isn't far off. She says it's her name and her choice. She isn't wrong. Has anyone's teenager done this, and did it last?