I'm sure it couldn't hurt. Good luck to you!
It also doesn't help much. Kathy is extremely busy, and I doubt that she will have the chance to return your call/message. I know that this waiting is difficult for most to bear; however, there is not much that you can do but wait. You already got an interview, and it is now in the hands of the adcom. Calling them will not expedite their decision of your application.
What do you really expect Kathy to say when you call her and ask about your status?
I am sure that you want to hear the following:
You got accepted, but I didn't get the chance to call you yet. Unfortunately, this is very unlikely. If you got accepted, Kathy WILL call you as soon as she can. Usually, you will get a call from her Thursday afternoon or Friday.
The most likely response (if any) is that your application is still under review and for you to wait, which does not really help you much.
The best thing for you can do is to relax and to not think about it. If they want you, they will give you a call. Look on the bright side, they did NOT reject you yet, so you still have a chance.
Good luck to those waiting to hear back from UW (interview/acceptance)!
Congrats to those who got in!