For her family's sake part of me is hoping it is her so they can have closure but the other half the me (the realistic part) says that this is not her. If she did drown then her remains are long gone (literally as well as figuratively - as you said).It couldn't possibly be Natasha Jugo, could it? If she had been in the water since she went missing in March, there wouldn't be much left to wash ashore by now. (I couldn't think of a more delicate way to phrase that.)
My guess is that this is a swimmer who had a medical emergency or got swept away by the current.