Her father Louis Kahn was a German-Jewish immigrant from Baden who married Pauline Freiberg, a member of a prominent Cincinnati family.
Of her performance in the latter The New York Times wrote: The only notable feature of the performance was the acting of Miss Florence Kahn as the strange girl, Hilda Wangel, a healthy buoyant creature from the mountains, who still has a touch of the neurotic in her composition, and is united to the unhappy architect by a mystic bond: who invades his household as one answering a spiritual call, awakens the better side of his nature to a mood of self-revelation, and inspires him to a symbolical feat which causes his death.
But it possessed a certain poetical quality, was full of youthful spirit, and was not always overwrought or artificial[9]Kahn also appeared with the actor Richard Mansfield, as Chorus in Shakespeare's Henry V in 1900.
On her return to America in 1907 Kahn appeared in Ibsen's Hedda Gabler and Rosmersholm in New York City's Lyric Theatre.
[5][12] In February 1908 Kahn returned to Britain where she appeared as Rebecca West in Ibsen's Rosmersholm, opening at Terry's Theatre.
They thought Kahn to be "nervous, shy, timid, retiring, humourless, moralizing, idealizing, prudish, frequently sad and depressed and anti-social", in fact the very opposite of Beerbohm.
[19] In 1931 the Beerbohms returned to Britain so that Kahn could act in Luigi Pirandello's play La Vita che ti Diedi (The Life I Gave You) with a small repertory company in Huddersfield.