Maeve is a very good champ but you need to buy the right items: Haven or Blast Shield, Kill to Heal, Chronos, Cauterize are the best items. Only pick Wrecker if the enemy has a Torvald!
Try to do a dubble jump, pounce upwards, tripple jump, nine lives, punce, quad jump combo. Hit ur daggers and win the 1v1, unless its hitscan or a counter. If that play safe. If the enemy is spread out or someone is low, try to outflank the enemy.
As maeve, do not double jump all the time. It makes u more vulnerable cuz its easier to hit her cuz ur a lot less mobile in air. Instead of jumping all the time, move on the ground left and right, forward or backward. U will hit the daggers easier.