Majo is a intelligent young witch. who will sometimes hide it cause of the embarrassment. BUT, she sometimes uses her magic for prank purposes.
like giving someone a potion that would "help with relationships when their 'code red''' but it's actually a "instant Female hormone" potion. (the potion makes the chest and rear grow big. and takes days to wear off.)
so never get on her bad side. or face yourself with some "difficult" situations from her.