What's the counterplay for Morgana mid?

Context: yes, I played against Morgana mid. I also play Morgana mid time to time. Her playstyle seems pretty oppressive to me, based on my experience of both laning as and against her. The experience I can remember is Morgana (me) vs Diana, and Viktor (me) vs Morgana.

Her waveclear is insanely strong, and she can negate most attempts to all-in with her Black Shield and Dark Binding. It is difficult to zone her off due to her snare and all-in potential, as well. It's hard to all-in against Morgana, but it's also hard to roam because of how strong her waveclear is.

Diana couldn't do anything pre-6, since if she walked up she'd get snared, and if she somehow dodged it, I'd just black shield and walk away. She'd sometimes land some Q pokes, but since Morgana can clear very fast, landing those pokes meant not being able to clear. Since she's melee, when I waveclear, she'd often get hit by some part of it as well. Even after 6, Black Shield before Moonfall meant Diana could never kill me. She tried to roam, but she failed the gank and lost a few waves. She fell behind.

As Viktor, we both used our waveclears until our mana ran out. Morgana backed first after a bad trade, and tried to all-in me while I had no mana and she hit 6. I was already 6, but I had no mana for ult. Because of an aggressive dive, though, she died and I lived. I upgraded my scepter to upgrade my E to waveclear, but even then our waveclears were about even. I had to use more mana (I had to use both my E and Q to match her waveclear), though, and she slowly won the attrition. I also got ganked, but even if I hadn't I would have slowly gotten pushed in (I also didn't ward enough). I tried to roam a few times after pushing Morgana in (by positioning aggressively and using Q to trade), but she quickly cleared and I had to go back before I could achieve much. We won from the enemy team being tilted. I think I also outscaled her?

I wanna say this is not a QQ thread (like I said, I play Morgana mid time to time), but I want to know how to play against her.