This is my current build right now, 6/0/6/6/6. It's a mix of melee and sniping, but it's mainly for sniping while dealing pretty high damaging melee during close quarter combat. It's actually my favorite for her right now. I got tired of the melee build, but here is my melee build. That melee build works much better with a high cooldown since you can pull out a two SSs within a small timeframe while maintaining the 80% damage bonus. The alternative one is this.
I would also like to add a "like" to the above.
Currently running a melee build Identical to the above. I use the Scimitar with Omniblade and HVB for a +100% CD and cloak/SS/HM spamming.
It's a great fun build, but you'll need at least AP Ammo III if you want to take down a Gold Atlas in less than an hour 
To hit a group of 3 mooks:
Cloak - SS first mook (make sure you take the fire one power while cloaked evo), SS second mook, Heavy Melee the third.
And when the Phantoms come out it's play time (just don't let them see you before you cloak - you might get a nasty surprise!).
With Hydraulic joints and Strength Gear III you can also one shot a turret, so you can see it makes a great kit v Cerberus (Just leave the Atlas to other players
).