@miyako19 But my personal view on things is that it's not about duty with Elizabeth, it's about love. For love she willingly threw away her own moral compass (because I suspect she knows a lot about Ciel's plans and actions) and her family.
Maybe she's struggling with the decisions she made and I'll see another side of things in later chapters, heck maybe it's truly only about duty but from how I see it...
Elizabeth isn't bound to follow blindly and I feel that's what she's doing,
because she loves her Ciel.