Who was lady Comstock

bioshock-infinite

During the game from the recordings on the voxaphones made by lady Comstock, she repeatedly tells that

She is a sinner that have done many bad things, and that she doesn't deserve the forgiveness that the prophet gave her.

The question is

What did she do before she met Comstock, and what are her sins?

Best Answer

There's not much backstory on Lady Comstock in the game proper. There's but one Voxophone that goes into any detail:

To those who loved me, I was the most generous of souls. There was no pain I would deny them. No betrayal I would not gladly give. And when I had scorched the hearts of all who loved me, the Prophet said, "There is nothing you can do for which I will not forgive you, for God has granted me sight, and through His eyes, even you are loved."

When I heard this, I interpret it as:

Lady Comstock was beautiful and had many suitors, ("those who loved me") and she was particularly abusive to them ("no pain I would deny them[,] no betrayal I would not gladly give"). It's possible she's also referring to her family, though.

This is still relatively vague, but:

In order for this to be something so terrible that it would require the level of forgiveness she references, I assume she must have been unfaithful towards her lovers. She seems willing to forgive quite a few serious transgressions the Prophet does, including mass murder.