That's fascinating! Do you happen to know what her financial status was? Is there a way to check to see if any other death certificates have it written like that? What about Census records, what do those say? Finally, what nationality is this person?
These are all questions that may matter. For example, most Americans referred to house wives as "keeping house" about that time but the English may word it differently. Also, if she was wealthy she could just be living on her own day to day. She wouldn't be 'keeping house' because she probably had housekeepers. If she were poor, then staying at home would not be an option, she would have to be working in which case this may indicate something they wouldn't want to record, such as a prostitute (no offense, of course).
As you can see, figuring this stuff out is like painting a portrait. Without the rest of the picture you cannot really tell what it is.
Good luck and if you find out, please post back because I'd love to hear!