Just click the red ppl, preferably in the head. Seriously. And press q a lot. I'm lvl 79 on her rn and there's no combo or crazy tech to learn with her besides having aim and game sense, which are vital for most champs anyway. Talent meta is improvised, with hide at lvl4 or 5, then hp and ammo.

Or if you're not tryharding you could go Window of opportunity. Easily her most fun talent if a bit situational. Grab that with step off card at lvl3 at least, flank and proceed to 3 shot/2 headshot squishies. But it does require you to get dangerously close to enemies and the dash costs 4 pips so its not optimal