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.
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Encountering Grover in long range spaces - don't PEEK around the corner.
Good Grover players throw axes preemptively and you can take a lot of damage. Use short sprints between cover. This way it's harder to predict where to aim.
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