I know you probably have some PTSD from the last time so this is probably triggering your fears.
I think for me, if I were in your shoes, I would trust but verify. If W being in communication with OW is work mandated, there's not much you can do. She might not tell you because she doesnt want you to flip out about something that's not there.
Keep working on you and your relationship for the time being. If W is up to something sneaky, you will find out.
