Nothing happened. She's a whack a doodle or a pathologic liar, or both.
Let me ask you this:
Why would she wear a Full Body Swim Suit to a party?
This is why you have to actually listen to the story first. She had spent the day swimming and diving. Generally you don't do that in formal clothes. I've certainly done that, especially at that age. Billions of people have done that.
Sorry putting your words in glorious hard-on bold font doesn't make them any more 'powerful'. Get over yourself.