According to the local Fox news, the Manatee were attempting to mate and the woman chased them around, climbed on their backs and held them under water while they struggled to get free.
She did this in Fort De Soto Park, which has strict rules about not terrorizing the wild-life.
If she wants to ride something in the water, she should get a floatation device. Or maybe try riding two sharks while they try to mate.
Oh my, I did not know the entire story. I am sure those manatees did not want a threesome!