Well the telepathy alone is a problem from Wanda. But the easiest way for her to win is simply put her runes around Hogwarts. That way she was the only one who could use magic.
People forget Wanda has shields, very powerful ones. Also she can control demons strong enough to get a Sorcerer supreme. She could easily just unleash them on the school.
The problem with the Hogwarts offensive spells is they actually have to hit her. The issue there is they don't seem strong enough to get past her shields. Any passive spells won't do much to her seeing how she got out of the mirror dimension trapping her would be a problem.
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