Shock Pulse will bounce if it hits a deployable like Ying's Illusions or Barik's Turrets. If you are playing competitive and he is picked early, avoid using these two to make Shock Pulse more difficult to use.
If Meave isn't using Artful Dodger, and you have Surprise Attack, break hidden with Poison Bolts and do your hit her once from behind. Follow that up by using smoke screen to hide yourself and let the damage encourage Maeve to retreat.
You can attack Lian whenever you want. If she is alone, she won't harm you enough. Just make sure you attack her AFTER some trouble. Most of the time you can be sure she is completely on cooldown and thus an easy target. If she is NOT snipe her.