I hate to say it, but I would be surprised if you were wrong. Sure, you probably have the details wrong. But, I'd be surprised if this weren't in someway connected to OM. Her freaking, her anger, and her initial condescending tone would all be well explained by guilt about something.
Put it this way, if she wasn't hiding something, it would be easy for her to be compassionate and offer sincere reassurance.
Yes, you can tell the difference.
Maybe you can ask her about it tonight: "W, wow, what was that about this morning? I was really confused about your anger, and I'm sorry I moved to a defensive position. To be honest, your caginess and reactions to me felt a lot to me like before when you were planning to see OM. What do you think was going on in all of that? I, for one, could really use some direct communication here."
Then again, she may have just gotten in a foul mood because you were suspicious... Feeling helpless and hopeless, that she has forever tainted the love and trust between you. Of course, this would just call for more direct communication in my book...
