I actually interpretted Mrs. Lovett as being driven by greed and lust, not love.
- Well she does flat out exclaim that she loves him. And I believe her. I think it started out as lust as she states in "My Friends" that she always had a fondness for Todd. But I believe she loves him by the end.
I am a firm believer in serendipity- all the random pieces coming together in one wonderful moment, when suddenly you see what their purpose was all along.