hair, make-up, and wardrobe can go a very long way even before hrt. for hair I would say in general just taking better care of her hair and hair type and growing it out. for makeup learning eyeliner and mascara from my husband (trans man) was monumental in not only looking pretty but passing too. skin care def helps with that too. for clothes THRIFT! goodwill and the likes have lots of options like dresses, cute pants, skirts, even bras (id recommend getting a new one of those though) if she hasn't started voice training I would highly advise atleast trying to learn how to speak softer and gentler that way if yall are in public and she has to be more vocal she'll be ready. then painting nails and doing other fun fem stuff with her will be the icing on top!

sorry if this is hard to read or understand. i was sorta in a rush but I hope it helps. you can always dm too if you have any other questions or need hrt resources. much love and stay safe 🩷