Question from Alia - Mary Grey

Hi. Does anyone know anything about Mary Grey, married to Thomas Keyes? I have heard her name many times in researching her more famous sisters, Jane the Nine Days Queen (though she ruled for thirteen) and Katherine, who mfamously married the Earl of Hertford in secret.
Thanks!!

See related threads below:

http://queryblog.tudorhistory.org/2008/12/open-thread-sisters-who-would-be-queen.html

http://queryblog.tudorhistory.org/2009/01/question-from-nicole-mary-greys.html

http://queryblog.tudorhistory.org/2009/02/question-from-john-mary-greys-burial.html