Why was Mary surrat hanged?

Mary Surratt was hanged primarily for her involvement in the conspiracy to assassinate President Abraham Lincoln. She was accused of providing support and resources to John Wilkes Booth and his co-conspirators. As the owner of a boarding house where some of the conspirators met, her conviction was part of a broader effort to hold accountable those believed to have conspired against the government. Surratt's trial and execution were highly controversial, raising questions about the fairness of the proceedings.