Questions like this perplex me. If you think rationally about the nature of this game, then it's glaringly obvious that any woman working in paid sex will be advertising herself in ways easily accessible to her potential client group. If she's not advertising then she's not working, and you simply move on and identity alternatives in accordance with your preferences.
OP if you met her previously then you've obviously been around for a while. So participate and contribute, and maybe over time other punters will trust your motives. I never met her, and know nothing about her current circumstances, but even if I did I wouldn't be conveying that information to someone I don't know and with unclear motives.