Who is Melissa Cohen Biden

At one point, someone who was selling drinks stopped by their area on the sand, and they all bought fresh coconut juice to sip on while on the beach.  When she had enough time in the sun, she was seen showering the sand and saltwater off her body before leaving for the day. She skipped a coverup and opted to leave wearing just her bikini and her white flip-flops. She had a green canvas bag slung over her should as she walked alongside her friends.  Cohen and her friends were also photographed with Secret Service agents as they rolled suitcases down the street. It’s unclear if they were leaving Rio de Janeiro or moving locations.