How to play Leblanc vs. tanks?

I really love , she's the first and only assassin that i play. I've tried others, but the assassin class doesn't really appeal to me. But Leblanc is a blast!

My problem is that my performance with her is very binary. I usualy play reliable champs so i can focus on macro play (ex: ) but Leblanc seems very feast or famine.

I struggle against tanky champions (ex:) They will often outtrade me, outpush me, and outright ignore all my damage after some time.

If i don't win lane i usualy try to roam, but Leblanc's waveclear ain't great early, and she has to burn her mobility spell to do so, and some champions can outpush her really hard, which means that i can't roam at all without risking to lose my tower.

Obviously the best answer would be to NOT pick her before the enemy midlaner picks her, but sometimes i don't have that luxury, and i'd like to be more flexible with her. So does anyone have any tips on how to play her when you're getting outmatched? This applies against tanks, but also other champions that can bully her ()

I'd love to take her into ranked, when played right she can stomp the enemy really hard, but i refrain from doing so right now because my performance with her is unreliable, and i don't want to be dead weight.

Thanks!