Basically the point of this episode is that:

spoilers:
Wanda is a mutant. All human test subjects died when they touched the infinity stone, but the Stone detected something in Wanda and responded to that. As per lore, any baseline human who is not transformed dies on approaching the stone as it happened with RDJ, but those with enhanced stuff like Starlord could survive thanks to Celestial DNA. So Wanda is a mutant
end of spoilers