She got so mad she wrote song lyrics and edited a video and everything omg
A Ceillizzy headcannon for you: Lizzy will absentmindedly sing while's she's busy working with something and Ciel absolutely adores it. If he hears Lizzy singing he will either pretend to be working as well or stop what he's doing to stand outside the room she's in just to hear her. When asked about her singing he tries to play it off, "It's distracting and a bother....". But everyone knows he likes it.