25 or so years ago there was a spate of street girls getting bumped off and I got a letter from plod. as I had been spoken to about kerb crawling some years before, a very nice letter asking if I would care to assist them with their enquiries into these murders. Without hesitation I went along to the local station and I must say I was treated with every courtesy. They took a statement, DNA sample etc. and I have to say were no problem when I explained that no way could I remember what the hell I had been doing on certain nights months and in one case years before.
I would say to anyone who has seen this girl, provided you didn't bump her off, to make yourself known to the plod and you can expect reasonable treatment from them, as they are not on a vice kick but a murder investigation, and I shouldn't think they will be interested in any other punting you have been doing away from this poor girl.