Has Wanda ever struggled to manipulate matter that was more durable then normal matter?
I ask because usually when it comes to transmutation or reality warping, the burden of evidence is on the durable individual proving they are THAT durable to resist a thing that should traditionally not care how tough you are - within reason.
So has she struggled on screen to transmute or warp durable materials? There was some sort of armored vehicle that tried breaking into Westview at one point. Did she struggle messing with it?
Edit: my memory is that she did not struggle. She also molded Black Bolts flesh which should be nebulously durable on some level...