1. Keep on making WILD GUESSES (e.g. - you trade sex for $$$?,
you got raped?, you slept with so & so?) on what's troubling
her, say them one by one, slowly, & observe her reactions, till
you see tell-tale signs on whether you've hit the jackpot.
2. Cook up a story. Tell her that you know someone who had gone
thru some bad experiences (story-telling time, the worse the
better) before & had since recovered & that you find it
okay & took it very well...say it's normal as human beings do
make mistakes...then slowly, tactfully ask her WHAT HAPPENED.
3. Tell her you FOUND OUT what happened already. See what she has
to say & carry on ACTING & PROBING from there...