Joan Baxter was a child actress whom is only known to have made three screen appearances.
Knock On Any Door (1949) as Maria Romano (uncredited)
John Derek and Humphrey Bogart at the door. Carol Coombs is playing the piano and Argentina Brunetti is sitting on the couch. Joan's face is not seen much in this film but she does get to say a line of dialogue in this scene.
Dick Sinatra has his back to us.