"I believe finding her body and applying forensic methods of analysis would be the only way to solve the mystery of her death."
I can go along with this theory: Cleopatra narrows it down to two choices. Then she says "you, slave, and you, slave" and observes them die. Then she picks.
Can I have that grant now?
Wow, great! Of course, the slaves at the crime scene died after their queen, because they had to make sure her body looked just right. But testing the poisons that way would have been the preferred method.