I think the best place for information on that actually comes from Dave Taylor at the Boothie Barn in a post about Rosalie Booth which can be found here:
http://boothiebarn.com/2013/11/25/the-fo...ann-booth/
This wonderful article says that Mary Ann fell and dislocated her hip in 1884 at the house in New York, and "her mind began to wander." For over a year and a half she was bedridden - she had Rosalie sleep with her because she was "nervous" to be alone. Rosalie was even asleep beside her mother when Mary Ann passed away.
But take a look at the entire thing on the Boothie Barn - it has a lot more detailed information that involves Mary Ann, especially towards the bottom.