I think everyone needs to let go of the notion that she left voluntarily.
1. There's no way a 20-year-old college student has enough money saved up to survive very long.
2. She would have done at least some Google research about where to go, etc., and police would know.
3. If she had phone or electronic contact beforehand with some other suitor, that would be known to police. If there was another suitor, they for sure would have had at least some prior communication that can be tracked.
4. If she was gone willingly, she would have logged into her social media by now -- and police would know. No young person that age is not going to check social media to at least see what people are saying about her disappearance.
5. What could possibly be a motive for her wanting to run off, if not another suitor? There's no debt problem, no family problem, no crime to run from, nothing like that.
Voluntarily leaving in this case just makes no sense at all.