She was way too classy/fit and also unlikely to be plying her trade outside a busy station at 11pm on a Friday night.
If she WAS a street girl I'd happily have punted it.
As I say, I think it was just a weird occurrence, like the one OP had.
(I've also heard from several civvies who've had blokes ask them if they're "working" in very non-RLD places)
I had a young girl ask me if i needed help getting my bike up the stairs on the underground once , she was white , very smart and respectable so i put it down to her being well brought up and thoughtful but i did think wtf either i look fucking handicapped or maybe shes up for it , didnt want to risk upsetting her so assumed the first.
Ive seen the odd hooker on Dalston Lane by Dalston Junction in the early hours, its not inconceivable there being hookers in that area , and id say a pretty young black girl is more likely to be out at that time rather than later. Could be a hooker or just a well intentioned onlooker.
Been out a few times this week , brownswood - nothing , vallance - nothing , few girls about on fore st , romford road and ilford lane. Got a crap girl on romford rd last night , just wrote the £20 off.