Bill, I think about 99% of the time here, when a WAS files for a D they are having an A. And the only reason it isn't 100% is those few haven't found out yet....
Does this change anything for you? Are you 100% certain that she's having an A? If she is, then I would kick her out if she doesn't agree to stop the A and be 100% transparent with you. I wish I had done that myself. Puppy and Coach and others here know all about this. Hopefully will post here soon.
I wouldn't confront her over the phone. Needs to be an in-person conversation. If she calls you this weekend, don't answer it. You need this time for yourself.