Very good! It's almost a little comical, but completely manages to evoke the mental image of a portly woman stomping slowly along a room.
One thing you could do is try to extend that first bit of melody. Ten seconds in, I was kind of expecting a repetition of the section prior, but perhaps a key down; you could argue that breaking expectation is a desirable goal, but I'm not sure — I personally think it'd work well. That melody just seems like it's begging to be continued for a little while.
Still, good stuff! I'm sure she'll appreciate hearing it. :)