joliver, I'm sure she will contact you again at some point. most HPD's will keep in contact with just about everyone they have had relationships with, the only time they stop is when you no contact them. just how this thing started is an indication she intends to have you around as a supply source as long as possible.. she contacts you, an old college lover, out of the blue. many HPD's will look up people they knew in the past when their current supply is running low. (my HPD friend did this often, in fact, I was one of her 'former' friends when she reconnected with me out of the blue over a year ago.) the low supply she's experiencing could be due to a falling out with a group of people, which may have happened when she flirted with that coach. perhaps many people/ supply sources in her social circle found out about that and were annoyed about it. and no doubt she instigated the whole thing. my friend did that often, too, she would claim guys were chasing her when really she was the one chasing them or sending out the signals that she was interested in something more.
I suspect they look up old flames more frequently than the general population does, for a couple of reasons - there is less effort to get supply, because you already knew her in the past and have good memories of her; and because you are less connected to her current social group, you don't know what has gone on there and she can pretty much tell you whatever she wants about what happened.