The issue is that she has no problem at all getting up close, and the AoE from her weapon is generous for the amount of damage it deals, just aim at the floor, it's even effective at long range when shooting at the objective due to this.
And avoid her how, she's on you, you shoot her, she either kills you or iceblocks and heals up, gets a damage boost against you now and then kills you, if not you run, she blinks and kills you, if not you use a mobility move if you even have it, she soars goes wherever she wants and kills you, if not, she has blink available again, even though you're already dead for 10 seconds at this point.
She has an insane amount of mobility that you cannot avoid her, and if you can she still has an ult that will prevent it.
Best part is that her main weapon deals 930 base damage, yet only deals 100 self damage, where Pip deals 600 but has a massive 400 self damage penalty.