“It is quite evidently clear that this young lady was a member of this hard-nosed rogue society by the correct interpretation of the tattoo on this unfortunate young trollop’s...”
More likely since she lived following the Muslim conquest of Egypt, that her tattoo is of Saint Michael and that she died in her mid-20s she was killed by Muslims and, rather than a trollop, she is a martyr.
Like asking St. Michael to protect her and help her to remain pure. Or a reminder to herself that she belongs to God.