We might never be able to determine her true cause of death for sure because of differences between our times and hers. This is because the names of illnesses were usually vastly different than today, but more to the point, they way they would describe the symptoms of an illness would be different from today, so even if we had a really good description, we might not know what caused her death, exactly.Life expectancy was very short then, and things that wouldn't kill today killed then. We will probably never know exactly.