I like the thought of the boyfriend.
As to Sandra Marling ... I just don't see her as a bad guy. Not sure why other do.
Because, Rasins,
she's spooky!
Nah, there's a little bit of circumstantial stuff around her; the nametag printers weren't working all week (though that's just as easily from Molly's Murphyonic Field), she's the one who got Molly working with the convention, and she's also the one who planted the idea of using fear to combat addiction in Molly's head.
Personally, I didn't even remember the character until I started coming here a while back, and I wouldn't be surprised if few average readers do, so for that reason, if no other, I don't think she's important.