After two broken engagements because of difficulties over marriage settlements, she married Adolphus Crosbie, but was soon separated from him and retired to Baden Baden with her mother, where she died.

"Alexandrina was the beauty of the family.... She had, perhaps, counted too much on her beauty, which had been beauty according to law rather than beauty according to taste, and had looked, probably, for too bounteous a harvest. That her forehead, and nose, and cheeks, and chin were well formed, no man could deny. Her hair was soft and plentiful. Her teeth were good, and her eyes were long and oval. But the fault of her face was this, - that when you left her, you could not remember it" - The Small House at Allington