Disclaimer: I don't own Sweeny Todd (or any associated plots or characters). I just borrowing them.
What if the other woman ended up in the oven?
If anything, Mrs Lovett was surprised by how easy it was to drag Lucy into the oven and let her burn. The beggar woman's body was frail and wasted from illness and malnutrition while Mrs Lovett was strong from years of hard work and months of dismembering corpses. It wasn't until the heavy iron door was closed and the cellar filled with the smell of burning flesh that she thought about what she had done.
It's not like she had killed her, she reasoned, trying not to imagine the beggar woman's flesh melting and the golden hair turning black. She'd just got rid of the body. She'd had to get rid of the body. If Mr T had recognised her… She couldn't let that happen. Or, she knew for a fact, there would have been two dead women in that cellar.
Besides, a small voice added, it'd tear him apart if he knew what he'd done. Better for both of us if he never finds out. It's for his own good really.
There was blood on her hands, and she wiped it absently on her skirt.
Upstairs a woman screamed.