I don't think she contacted him via a sugar-daday-esq site. Because those people are as discrete as you can be. I see a lot of post talking about the dangers, but those sugar-daddies cannot afford any trouble whatsoever. They usually have wives, and/or a well paid job. They want absolute discretion, and certainly not a bad review.
Its usually the guys on the fringes that can be vague and unpredictable. She posted several things on fb for sale so anyone could have seen that and contacted her IMO.
SBM.
There's "sugar daddies," and then there's also escorting. And the two blend and merge in different ways. Think of the fate of poor MacKenzie Lueck. Not all men who are looking to engage in this activity are reputable, well off, or without significant criminal histories. No judgment here as to the lifestyle or choice, but it is a fact that some young women are choosing to escort quite casually these days.