My brother, I am an attorney, and I practice in criminal defense, among other fields. THIS HAPPENS ALL THE TIME. She is not motivated to "toot and tell" because she would be confessing to prostitution, which if not illegal in your jurisdiction (as it is in mine), is still a public Scarlet Letter. Do no worry about prosecution. These transactions by and large remain silent, because the parties need and want them to be.
for you. You have learned from this mistake, that is all that matters at this stage.