Ellie is a character in the NBC series, The Blacklist.
She arrives at Elizabeth Keen's and Tom Keen's home to take Tom to his physiotherapy session. After she leaves, she returns for her forgotten purse, nearly catching (and being caught by) the camera installation team.
She likely helped organized Tom's welcome home party.
At the Party to celebrate the renewal of their wedding vows, she states that Tom and Liz are getting married twice before she has married once.
She helps Liz, by treating Tom, despite the risk to her medical career.