I'm not trying to pry, just curious.... what were your arguments about this weekend?
You have to remember she knows you best. You have to take back your strings and stop letting her play you into arguments like a puppet. Don't give her any buttons to push. Arguing will only throw more gas on her fire my friend.
When you change, she will be forced to relate to you in a different way. You CAN control you. Take that back from her. She can easily tell when you have any negativity what so ever. You can't show her any. More fuel for the fire.
If she is acting decent then fine. If she starts to suck you into an argument or pull your strings, don't let her. Picture her like an emotional tornado. If you see a tornado headed your way are you gonna stop and try to talk it out of spinning? NO, all that will come of that is you getting sucked up into it's destruction and spit back out. Stay out of her way and let her spin by herself.
Believe half of what you see and none of what you hear. She doesn't know up from down right now and I don't care how she acts or what she says, she is not happy and if she can take away your happiness, better for her.
You have to remain strong and stop looking at her like your wife of old. She is not well right now.
Try not to make this more difficult. This takes a ton of patience and time for both of you. Stay strong.