Just pick something else. Maeve's mobility combined with her Double Jump and small hitbox makes it merely possible to land a shot on her, while she can burst you down in a few nanoseconds. Simply avoid her.
Evie really isn’t supposed to engage with the other Flanks. But in some situations you may have to. You are most likely to win a 1v1 with Maeve by using Evie’s Sbowglobe talent. Maeve at full health will best you at close range.