Flank/Damage pip is not as vulnerable as other builds use more caution when approaching him he has high burst damage and a heal. if your going to flank him try to wait till he shootsthe catalyst on someone else to give your self an edge.
While Maeve is very difficult to pin down exactly, champs like Drogoz or Evie don't necessarily have to aim precisely in order to hit her. Additionally, abilities like Seedling are extremely hazardous to Maeve, because they have a very large AoE.
Maeve has a particularly harder time than most champions with aiming, as her weapons have drastic gravity drop, and have projectile speed, which means moving around unpredictably will make yourself harder to kill.