Angus, All i have is my typewriter typed family stammbaum, descendants of Abraham Kohn, with the last dates in it at 1935, just as the family was leaving Germany.... No Cecile Netter Heinsheimer, no Mina Heinsheimer, no Franz Heinsheimer.
Anna Rosenthal first appears at marriage #14, page II (Minna Hirsch and Dr. Jacob Rosenthal), where she is one of 5 children (Friedrich, Anna, Emilie, Julie, and Sophie).
Anna Rosenthal then goes on to have marriage #47, page V, to Maximillian Heinsheimer, with 4 children (Karl, Friederich Fritz, Alfred, and Otto). There is a note that Maximillian was from Karlsruhe and lived from August 14, 1832 to January 5, 1892. No mention of him having a second marriage -- but there would not have been, since this was HER family's family tree, not his.
Since the record covers his death date and extends onward, it seems unlikely that they had a child named Mina.
Interestingly, though, her sister Julie Rosenthal, who married Dr. Bernhard Hartmann (marriage #49, page V) , also had a son named Alfred, and she had a daughter named Mina.
And her sister Emilie Rosenthal, who married Louis Mayer (marriage 48, page V) had a son named Franz and a dughter named ... Lina.
That's all i've got.