So my W went to see the MC last night for the first time since April. I don't know what to make of it. She sounded mad when she told me she was going. I pretty sure she wouldn't have gone without the being coerced by someone. I have talked to the usual suspects and they all tell me that they didn't know anything about it. I wouldnt go around back-checking and snooping. Accept it for what it is right now: a random act in the middle of a maelstrom. I hope that during your time there you validated her feelings and didnt share too much.
Does this mean she is trying to work on the M? I really doubt that is the case. Its just confusing. Should I ask her about it? It's really not that confusing: it doesnt matter why she went. She isnt trying to "work on the marriage". You would know if she were. Maybe she just wanted to get some intel on you. Maybe she didnt have any plans and didnt feel like sitting at home. Maybe she thinks the MC is cute. Who knows. Of course, you can look for patterns or trends. But I wouldnt read anything into a single data point.