Other than her bossy streak, I love her in Dead Man's Chest, which to me was the last good PotC film; she got to do more sword fighting and looked damn fine in a tricorner hat.

I forgot about that! At first it made me chuckle, and then deeply sad, because it means Cheryl thinks her parents capable of poisoning both Polly and their future grandchildren

I'm sure there is either blood or alien DNA in those 'daily milkshakes', to feed the Blossom spawn in Polly's belly.