Really, when it comes to her reign and all, the only thing that comes to mind is her using her sexuality for the betterment of the nation and her suicide.
Yeesh, I get the feeling that moderator /u/cleopatra_philopater wouldn't be happy to hear you say that. S'far as I know Cleopatra’s considered to have been an extremely effective bureaucrat linguist as well as being super multilingual and scholarly oddly enough.
These posts by /u/cleopatra_philopater ought to help:
What positive things did Cleopatra do in her reign?
AskHistorians' resident Cleo teams up with the awesome /u/XenophontheAthenian to explain How Cleopatra acquired her sexual reputation (hundreds of years after she died)
Hopefully these help you some!