It is really extremely a good thing Edie (sister/twin) cannot do fire. Of course, if she could set things on fire with her mind, she wouldn't have started trying to do so as a harmless expression of anger, but it would be briefly very unpleasant for someone or something if she ever actually developed pyrokinesis.
It's a shame she can't control the mindreading, but not inherently bad, telepathy is nice.
...Emily's sister is a projective telepath too. Emily has just as good a grasp of Edie's mind as vice-versa.