She's really fast, but a lot more fragile than she seems to be at first. Both of her (0) actions are powerful but suit-dependent. Her melee attack is a low Ml 5, but huge damage.
When I've had success with her, it's been in two ways:
First, as a Scheme-runner your opponent won't mess with. She can move quickly along flanks and your opponent will hesitate to send cheaper scheme-runners after her. She'll mop up Necropunks and Silurids no problem, occupy space for Recon/Interference, and so on.
Second, as a frontline sacrifice piece. She's got a melee attack, she can make terrain hazardous, and she can devour Paralyzed or short models. In the front, she's not going to survive, but she can require a lot of resources to take down. She's also great for Frame For Murder, because she's really, really hard to ignore.
I've seen other people use her in other ways successfully - in a crowd she's harder to gang up on and can occupy a lot of space - but these are generally the main two ways I've seen her played and the ways that I've found work best for me.