If there is a way to get back into your home, I would do it. You are right that she is only going to be able to continue her affair more easily and in her mind she is now fully "separated" and that makes it ok (in her mind).
Definitely don't read into the phone conversation about asking why you needed your suit, etc. I believe the questions she asks now will be for only a couple reasons. She wants to make sure she knows where you are because she doesn't want to get caught, and because she will be afraid she won't know all that YOU do (loss of control).
If she is having an affair and you have proof, will it change what you do from here on out? How specifically?
