She loves Todd deeply, and so she claims that his wife, Lucy, died because she poisoned herself in an effort for him to forget Lucy and love her instead. Todd never returns her love, and in the end, she dies once he realizes that she lied to him, and in his madness, he kills her. THE END.
A wish...her hope...slip't from memory to 'er eyes
Soon Mrs. Lovett would be more than a lonesome miss
Hard worker, on her grind, the baker became accomplice