Actually, Matt, what happened was that Ruth was standing behind her mother, as Lifeboat #11 was being loaded. As soon as Marion & Richard Becker were placed on board, the command was given "That's all for this boat!!", to which Nellie Becker pleaded to be allowed in, exclaiming "Please, these are my children!! My babies!!". She was, thus, allowed in the boat, at which point the order was given to "Lower Away"!!.
Nellie, realizing Ruth was still on the Titanic, then screamed "Ruth!! Get in another boat!!", to which Ruth immediately proceeded to Boat #13, and was allowed to get in.
It was the next day, after everyone got on board the
Carpathia, that Ruth started to look for her mother, brother, and sister. That was when a woman stopped her, and asked "Excuse me, is your name Ruth Becker"?. When Ruth answered "Yes, it is", the woman told her, "Well your mother has been looking everywhere for you". At that point Ruth was reunited with her family.