I watched a documentary and it talked about how during the dark ages people would steal stones and what not. After Justinian died Theodora took his place and she caused it, but how?
The Black Death had previously broken out in Asia and it traveled to Europe via ships which were infested with rats carrying fleas which in their turn carried the disease within themselves. These rats left the ships when they reached port and their fleas infested the local rats, which carried the infection all over the place. Bubonic plague, being highly contagious, and no one understanding the disease or how to prevent it, spread like wildfire across the continent.
I really have no idea why you would think that Empress Theodora could possibly have anything whatsoever to do with the plague. Quite apart from the sheer impossibility of any one person creating a disease wholesale while lacking access to modern laboratory equipment and specimens, and being completely uneducated in modern microbiology and medicine...Theodora died 800 years before the Plague reached Europe.