This mare needs to lose herself. She is mean, ignorant and doesn't care about anypony. She has made a shield—a sort of mask—to protect herself, and in order to make a change. She needs to get rid of it. But it won't be so easy. The mask has turned against her.
Or is it really just a mask? Maybe she is just mean, ignorant and indifferent normally.
Anyway, she needs to change herself. One way or another.