At the moment I read a biography about Margarethe Krupp (born as Freiin von Ende) and there are some Infos of the family of Luise Margaretes mother.
Margarethe von Ende worked before her marriage to Friedrich Alfred Krupp as a gouverness in England and at the court of Anhalt.
She was governess to Princess Alexandra of Anhalt and had livelong contact with the princess and her mother Duchess Antoinette.
The biography was written by Margarethe Krupps grand-grand-child Diana Maria Friz, who had access to the Family Archiv.
At the time when Margarethe Krupp was at the Anhalt court, a sister-in-law to Duchess Antoinette came to stay with the family.
The Duchess told Margarethe about the sad life of the princess, who was unhappy married and mother of five children.
Also the Duchess had to explain the governess that person she could take care of was lesbian.
Margarethe felt sorry for the princess and had sympathy with her.
But when they meet, they liked each other and shared a live long friendship and correspondence.
There is no name mentioned, but it can be only Maria Anna von Anhalt-Dessau (1837-1906),
she was the only sister of the Duke Friedrich I. who was unhappiely married and the only one with five children.
The Krupp Family Archive in Essen still holds the correspondence of the Anhalt court and the Krupps.
And also the correspondence with other royals.