Eeeh, sorry to but into the conversation, but if it were as simple as it got in the way... then she probably would have cut it when she got older, but she never did!!!
With that in mind, I can't help but think her long hair, is her one secret girlie pleasure. I imagine her hiding in a closet brushing her hair to silky ends like her bangs normally are but never dhowing anybody but one ^^ whoever that may be, would consider themselves lucky to actually get to see THE Toph Bei Fongs long black hair loose.
Lol when I was young I was quite the tomboy tree climbing girl that loved nature and most importantly, being comfy. I used to hate tight jeans, never wore makeup and hardly EVER bothered to brush my hair and just throw it into either a low or high bun/ponytail.
lol as a 24 year year old things are different, actually as soon as I became a teenager that started to change. Granted I'm sitting here on my ex's laptop in a tanktop/flannel pink pjs and my hair in a messy bun lol so I haven't changed much. I still prefer being comfy over spending hours on hair make-up and wearing uncormfortable clothes. No bra no shoes LMAO!
I wear make-up every now and then. I dress up every now and then, sometimes I even bother straightening my hair! I wear more fashion forward clothes, tight jeans or skirts and dresses. I do my hair differently sometimes but I still mostly wear my hair up, sans make-up and in loose cloth pants and a t-shirt or tank lol that's just me, but as a girl, as a woman I've had boyfriends and I AM a girl, sometimes I just wanna feel more feminine, sometimes instead of being lazy and content I wanna go all out, and I love when I get complimented on it.
I'm sure Toph would love the heartbeats or heads turning lol.
I don't see that situation changing much for Toph. I'm sure she'd still be a badass, kickass, tomboy but she too would be girlie and have her moments of feminine prowess. She does end up having a lil girl afterall lol
And she already has the mannerisms of high soceity, knows how to dress and act since we saw in the series, this being a canon fact. She was born and raised kinda lika Asami but of course she's secretly a kickass, tomboy loving, not caring, sarcasm loving girl who loves getting dirty.
But we do all grow up, even if we keep those tendancies. There is a saying for this. The more things change, the more things stay the same. Best (lol sometimes worst) of both worlds haha