Have to admit, my overall hunch is that ML was lured into something that was beyond what she would agree to - that the unknown person had nefarious intentions from the start. My hunch is that a tragic accident didn't happen, but a purposeful, harmful act.
I'm considering other options, too, but I'm thinking she was noticed by a stranger online and lured. If this were someone she knew, I don't think that person would harm her but would want to keep an arrangement with this beautiful young woman going. A stranger would be more willing to use her once, for something specific. Total speculation.
jmopinion at the moment, subject to change as we learn more. I could be way off base.