Original sentence: However, von Meck's second daughter Alexandra—who had literally shocked her father to death by revealing to him that her sibling Milochka was actually not his child—told her mother about Tchaikovsky's homosexuality at the outset of her relationship with him.Meck's claim of financial ruin is disregarded by some who believe that she ended her patronage of Tchaikovsky because she supposedly discovered the composer's homosexuality.Poznansky writes that Tchaikovsky expressed only once in all his published letters and diaries that von Meck may have known his sexual secret.This one instance came just as Tchaikovsky was most fearful about his flight from Russia after he had left Antonia
Edited sentence: Von Meck's second daughter Alexandra had literally shocked her father to death by revealing to him that her sibling Milochka was actually not his child