what a mess

after all them dental bills and braces and enemas

cat rules!

turn freak on her one time
you are whipped

yeaaaahhh she's got it baaaad

she might be trying to re-mark her territory after you have removed her
scent when you vacuum the place or remove the used litter from her box.
don't know how to stop her doing it though, maybe don't vacuum so
vigourously next time? or perhaps leave a little of the old litter in
the tray when you change it next so her scent is still there?

Sounds like a nervous condition to me.  Cleo Carrington Smith
hides in the bed if I drag the vac out but thankfully doesn't pee.

Some cats urinate under stress conditions.   It is obvious your cat is
terrified of the vac.   Also try leaving a little of the soiled
litter in the box next time (with the fresh stuff) and see if your
cat will still use it.  

She may be feeling stressed and threatened - try putting the litter
box in a quiet location where she has privacy, or get one of those
hooded ones.  

Finally, talk to your cat, explain what you want until she
gets the idea.  I have found that talking to my cat a lot has
produced a very relaxed and secure feline.

rachel