DEEP DEEP BREATHING, that's what you need to do. Go for a walk, get out of the way, do NOT fight with her now. And remember BE HAPPY AND POSITIVE. Act as if this never happened.
Think about it, if she sees you upset and acting sad it's not going to work the way you want it to. She is going to get mad and take it out on you because she feels bad. She's going to push for a fight so she can justify what she's done.
Now, don't go and give her a gold star, but do NOT break down.
Do not give up hope no matter how dark it is.
According to DR, it's time to get into LRT.
You CAN do this. You CAN save your marriage.
I think she is confused. A filing is nothing and can be pulled back easily.