Wanda has never really considered how fragile human bodies are. They're far more fragile than some of her other bodies and yet somehow they're not.
These bodies are strong, and good, and far more than functional (after all she's lived on planets with far less than ten toes and far less colours).
But they are susceptible to emotion, human feelings that are so overpowering that they cripple her and leave her unable to breathe under their weight. They drown her, until she feels like her Soul is going to explode out of its Host.
It's like nothing she's ever felt before.