This having happened in the Chicago area and the woman having gone out alone at 0600, there’s at least a reasonable chance of foul play, a lone woman on a bike being a pretty easy target.
I'm inclined to agree.However,two things make me wonder 1) at this time of year you get full daylight at 0600 2) although I don't know Chicago well I think I've read that Wilmett is a fairly prosperous,if not *very* prosperous,suburb.If I'm correct about Wilmett it would seem to lessen the chances of foul play.