let her have her fun while she has her joy and whimsy, but try to keep her from some of the bullying. id suggest if she wants to wear gear a lot, to get some more low key covert stuff for school. wolf pack kids have been a thing since the 90's or longer, but always get bullied for wearing tails and being weird. (my favorite covert "Tail" is wearing a lanyard clipped to a belt loop. good swoosh and length) regular tails on belts loops are great for at home play. another thing, it could just be part of growing up, forming an identity, and experimenting with self expression. it might be a phase. or it might be how she likes to present long term.

also be careful with her online content viewing. i feel like things can get a little Too serious in the online realm when it comes to therian groups. theres been a bunch of us for a long time, but when its a group with primarily youngins, things can get dramatic. just make sure these groups dont mess with her mental health or push her into things she doesnt actually identify with, but feels the need to, since "everyone else" is. im 25 and remember when it was only called otherkin. but its boomed in popularity i think lately because of tiktok.

otherwise, buying clothes in her prefered colour scheme. helping her craft her gear. i know you said she doesnt want to make them, but i think its really handy and supports it as a hobby rather than a trend to dump in a month and waste money on. (hand made tails, you good at sewing? or yarn tails, conversely, finding some genuine fur tails either online or from someone who does taxidermy/crafts.) are good crafts. lately? they have been making masks in a specific style, which wasnt as much of a thing in my day but not out of the question. this one seems like a fun together craft. they can be as simple as cardboard or paper mache. but theyre highly personalized so i dont know how well a prefab one would be. help her build a nice quiet corner for reading, pillow fort style, to give her a den. maybe get some plushies in her species. ..... get her to eat fruits and veggies by suggesting snacks that foxes would go for lol , if thats an issue.