That's the only location in the game where you meet her, but you learn a lot (of false information) about her from Klasje, by searching Ruby's truck (which I didn't even discover on my 1st playthrough), and from the Hardy Boys. I've had a pretty long convo with her in that hideout, but it probably also depend on the type of character you are building. That said, whether you kill her or she runs away, it does feel rather abrupt.