This girl sounds a lot like one of my current roommates - she's nonbinary and going
only by they/them, also a talented artist who even makes a little side income out of it, and while not a furry she does have some stuff around the house that suggests she might be into Wicca. She's also self-proclaimed bi, though has only been in relationships with guys to my knowledge. She mentioned that she felt she was bi just because she felt attraction to fictional female characters.

I always thought it was really odd that she identifies as a they/them NB - like your friend, she dresses
very feminine, mostly wearing dresses even. In general, she just presents herself as very feminine in every way. She's into cooking, gardening, all that stuff. The only hobbies she's into that aren't outright associated with femininity are fencing and gaming (which she just got into this year). She's got a large friend group with a healthy social life, high academic achievement, and is co-captain of said fencing club. So I don't really understand her need to be a special snowflake. I know she's deep enough into the woke stuff that she flies an LGBT flag on our front window, so maybe she feels the need to push herself into being a part of that crowd rather than just being an ally/supporter, I dunno.
Meanwhile, I'll admit that I have and still dabble with the idea of identifying as NB. Though I don't give a shit about pronouns and think it's ridiculous to try and enforce others to call you by a certain set of them. But in my case, in contrast to my roommate, I've always dressed in a more masculine or neutral way outside of special occasions. In general, I have more male-oriented hobbies and interests, and my behavior/personality is more leaning-masculine or neutral. I consider myself straight, but I hate having to play the role of the female in relationships. Now, could all this be because I had a shitty, emotionally-absent mother and no decent female role models throughout my life? Possibly. I don't know if my masculine-leaning personality & demeanor is truly me, or just the pure product of circumstance. I guess that's the issue for troons, too.
I've never felt gender dysphoria, or
any desire to modify my body, because I don't see a reason to. I agree with the general consensus that all that shit does is
reinforce prescribed gender roles and expectations. It's what makes me question the whole NB thing, too - I'm only thinking I should be considered NB because I don't fit the stereotypes of being a girl.
For me, calling myself NB has nothing to do with wanting to be a snowflake - I couldn't care less about winning approval points from the often-misguided LGBT community - and more of the idea that NB is a "warning label" telling people not to expect me to act in ways that align with my birth sex.
As absolutely stupid as all this troon shit is, I do think it raises some fascinating questions about prescribed gender roles associated with birth sex, and all that.
It raises a perhaps disturbing question about whether any natural deviation from said sex-assigned gender roles is caused only by things such as failed parenting, as in my case.
That's a whole other rabbit hole, though. Sadly, the vast majority of troons lack the basic self-awareness to even realize those questions at all, much less think about them.