Wendy is definitely the most bullshit character in the manga now. The moment Eileen turned enchantment into a magic that can do literally anything, instead of just buff people, Wendy became pure nonsense. She was shielding people, swapping bodies, transferring powers, giving swords Slayer magic, separating people from their magic, making stuffed toys attack like she's fucking Bixlow, that Alta Face shit, etc
Erza overall has been pretty solid in 100YQ. Her fight with Laxus was the best this new manga had. Natsu is still bullshit, but even he's not competing with Wendy.
The fact that Mashima has to explain her magic every fight instead of just casting a spell like a normal character gives you an idea of how nonsensical it is.