Do we have any genuine evidence here that young women are 'identifying into disability' rather than, y'know, actually HAVING one or more disabilities?
If young women using canes is more commonly seen then it is indeed a trend that can be observed. I would be extremely wary of labelling it as some sort of fashion trend, that is being consciously and deliberately adopted.
Being autistic is known to increase the chances of also having e.g. EDS or some form of joint hypermobility, which would make the use of a cane potentially quite helpful in getting out and about.
Autistic people tend to have more problems with sensory sensitivities and fewer problems in breaking social convention in the name of 'looking normal', so are more likely to choose comfortable clothing. (Hello, dungarees).
Being autistic massively increases the chances of also having ADHD.
ADHDers tend to embrace the wearing of colourful clothing for dopamine hit purposes. (Hello, brightly coloured/patterned dungarees and maybe brightly-coloured hair as well.)
Being drawn to bright colours, and with the likelihood of mobility issues that are helped by the use of a cane, is it any wonder that young AuDHDers (people who are both autistic and ADHD) decide to purchase and use the sort of mobility aids produced and sold by companies like NeoWalk? Especially when (via social media) they see others, like themselves, using these products and feel less embarrassed at the thought of using a mobility aid than young women like them would have done 10, 20 or 30 years ago when the only option was a 'granny' style walking stick or an NHS greige crutch.
I'd bet good money that NeoWalk themselves have had a major part in the increase in young, disabled women using sticks. Because it's rubbish to need a walking stick when you're still a teenager, but if you can collect them in a range of beautiful colours and see others proudly using them then it can turn something very negative into something positive for them.
And I'm all in favour of that.
(From a middle-aged autistic woman, who loves colourful dungarees for the comfort and dopamine hit. And also thinks it would be kind of cool to have colourful hair, just as a big Fuck You to the societal assumption that I should now become entirely invisible to society as my reproductive ability winds up. But actually doesn't dye her hair at all, because it's far too much effort and because sitting in the hairdressers making small talk is not her idea of fun.)