Conversation so far:
what conspiracy was Mary Surratt involved in?
She said that she made the trip to collect a debt owed her.
what debt was she collecting?
owed her by a former neighbor.
why was this a conspiracy?
according to her tenant, John Lloyd, Surratt told him to get the "shooting irons" ready to be picked up.

Question: who wanted the shooting irons?
Self-contained rewrite: who wanted to get the shooting irons ready to be picked up in the Mary Surratt conspiracy?