Set out Luna, and mark Maeve so Luna can rush and stun her. Even with the stun gone, keep her marked because Luna can still deal auto-aim attacks to Maeve. Though once your fox is dead, run away. LUNA counters Maeve, not you.
Grohk using maelstrom can farm easy damage off of your team using Luna. Your best bet is to hide Luna behind a shield if you're capping the point with Luna. With totemic ward, he counters Luna's rush and your ult.