I laughed
I didn't expect that. An amusing touch and a well made movie.
Two things I noticed:
Firstly, the frame by frame when she is opening the envelope wasn't particularly well done. If the framerate is high, it might be worth only animating every other frame. This usually isn't very noticeable and makes frame by frame easier. Just try to be neater really.
Secondly, I think you overused the blur filter. Try just adding more detail to your backgrounds so you don't have to overuse filters to make them look better. Maybe use bitmap masks to give texture to object.