Give MF the ability to crit on the first hit of Q.
That way is not harmful for the player to actually use all the skills on MF come late game.
IE+PD+ZEKE active = No reason to Q ever.
Even without Zeke, you are better of taking your 55% chances than using the Q.
Her early game is already gimmicked and inconsistent, we could at least give her a more reliable late game. Or something.
Just make her better, not just a hard hitting bounty hunter, she has no identity. She is not an AOE ADC, those are Jinx, Twitch and even Sivir, she is not a duelist That's Vayne, Draven, hell even Quinn.
Define her and give her something, personally I would love her ult doing extra dmg if it only hits one champion, or make it work like Vel's ult, so you cant just walk away from it.-. Or make her W active work like teemo's W, a stronger unstoppable version of her passive.
God, is not really hard to do this things, even just a change on her W would be enough, not really hard you already have an ability that works like that...
