Sophie was accused of betraying the family by taking money from them and later informing their guards that the Romanov children had sewed jewels into their clothing.(King, Greg, and Wilson, Penny, The Fate of the Romanovs)
Buxhoeveden borrowed 1,300 rubles from the Romanov childrens' tutor Charles Sydney Gibbes to escape Russia. Though she told him she'd return the money, she never did. "I knew she was greedy, but I never knew she'd go that far!" Gibbes wrote to the French tutor Pierre Gilliard.(King and Wilson, p. 505)
She was not trusted by the Tsar's sister, Grand Duchess Xenia Alexandrovna of Russia, who warned Victoria that "Isa" (Sophies nickname) was not to be trusted later, when Sophie lived at Hemmelmark for some time.
Sophie was the one to identify Franziska Schanzkovsky, the so called Anastasia during the first time Franziska stayed at Dallheim. It was when Franziska said she was Tatiana. Sophie did not recognize any similarity.
I think maybe she took the money from the family, who knows? She later made good profit with her books about them, too. Do you think Alix would have liked to read those books about her and her family life? I do not think so.
We say in German:"To bite the hand which feeds you."
ImperialHighness