Hey, I see lots of pro's posting their high end plat builds but you said you are not very good with her at the moment, so I would definitely suggest something similar to Excella's alt build
http://kalence.drupa...34556364!038B9G
This also happens to be the build I enjoy most on her.
About the build, duration and bonus power on cloak allows you to SS twice per cloak or just once and move off stealthed after first strike if you can't find someone on the edge to safely SS a 2nd time. This also has the benefit of not needing the SS energy drain or protection evo's in SS as the stealth in most cases will imo provide superior survivability, as well as just using longer cloak on other things (revives, objectives ext). This build will also kill most mooks in one shot and those that live you can finish with a melee strike if your in a safe enough place or move to cover while still cloaked and feed em a wraith shot to finish them. I prefer the extra armor damage on melee as i find it more useful, as well atlas's which you can't SS this works really well on them, just do it at their back.
Also if your fast enough, you can SS a tougher enemy with mooks around, which will be primed, and then electric slash while still cloaked to get a tech explosion.aka Atlas that isn't focusing on you. As well if you have a jugger in the group, follow them around and SS all the extra's that come after him followed by ES.
Weapon, well lets just get it out of the way, I'm a scrub that uses the wraith with heavy barrel and omni blade as it glitches and doesn't actually add to the weight of the wraith. This allows you to keep up a high cooldown while using a good gun. Alternatively the Disciple or Piranha work just fine as well and you probably won't be shooting your gun that much with a melee focused build.
This build synergy is really good, offering great survivability / utility and I also find it the most enjoyable.
So cloak, target enemy on fringe or even a group and SS, bonus power will keep you relatively safe, and then ES to tech burst or pick a fringe target for 2nd SS that won't expose you to much. If enemy isn't finished, it is faster to just melee them instead of SS if no one around, otherwise move to cover and shoot them to finish.
Once you are comfortable with this build, you would be primed and ready if you want to try some of the higher damage / higher risk builds mentioned above that go damage instead of duration on cloak and/or no bonus power. To me though duration and bonus power just bring everything together for this kit and I rarely go down on gold. Without bonus power you decloak on every SS exposing you to lots of retaliation, making it so you spend much more time looking for suitable targets that don't have lots of friends around, as well you lose some tactics like cloaked SS > ES for tech explosion for groups of mooks as your exposed right away and on gold+ you run high risk of just bleeding on them instead.
One last word of caution, always cloak out of site of enemies as SS'ing enemies that are looking right at you when you cloak, like phantoms or dragoons who might kiss you first.
Hope this helps you out and I would love to hear if this helped you out or not.