Her daughter, Marie, was then adopted by a greek family.
Don't know if she had any further contact with her mother or her danish/greek family.
Eventually she married a Mr. Hjalmar Pløyen-Holstein, which seems a very danish name
Either she returnedo to Denmark or Mr. P-Holstein travelled to Greece
Again, there is no proof of what happened to the daughter - if there was a daughter - and you seem to have missed that Bo Bramsen changed many elements of the story when he published the second edition of his book "Huset Glücksborg". For instance he largely denied everything he wrote in the first edition about the alleged marriage to Frode Pløyen-Holstein.