Yeah, I remember reading this when it first came out and thinking Sylph was a pretty good villain for Nightwing. Certainly better than the third-rate Batman castoffs he'd been saddled with for most of his run (though IIRC wasn't Lady Vic introduced in his series?
Was kind of disappointed that they never did anything else with her. I think there could have been a lot of potential. But hey, maybe someone will pull her out of limbo one of these days.