Do you know any left handed children that spell like this?

My daughter is left handed and highly artistic. I recently started her on spelling and she will spell normally left to right and the letters the right way when I ask her. The letters all facing the right direction. She LOVES to spell and always will ask how to spell a word and will do this for hours. She knows all her alphabet and can spell all the letters when told which one. The weirdest thing is she spells the words upside down and backwards, but with the letters ALL the same. I don't think it's dyslexia, but I've never seen anything like it. I have heard of Leonardo Da Vinci doing it, but I don't know what to think or how to approach it. Should I let her do it in her spare time? She can write both ways easily....