STUN STUN STUN... when with allies stunning anyone without a shield (excluding portable shield like tarvold's) can be your priority to help your teammates clear the point
Lian's biggest advantage is superior range/pokes. Use the map to your advantage and try to sneak up on her, and once you're close enough you should be able to take her out. Use Shadow Step to evade her Presence and especially her ult.
Kinessa's reload is fairly long, letting Maeve pitch damage in for free while you're reloading. If she's the only flank around and your team has other offense items covered, you could grab Deft Hands to help out an engagement.