I have come home to an emptied house....What next?

[Awoken]

Changing the locks is an option, but this will be done when things turn really nasty. Again keeping things to the same level for now.

Is her name on the house title or mortgage? It may not be legal for you the change the locks until that is changed.

On the other hand, if she is still on the mortgage, then she may still be obligated to help pay the monthly payments. Does she expect a share in the equity of the house? A portion of those payments likely go towards equity.

Again, I think you need to see a lawyer right away. This stuff is complicated, and our emotions really lead us to poor choices.
I could tally up the advice I ignored out of fear of driving my WAW away, but you get the point right? Don't view seeing the lawyer as a step towards divorce, but as a step in protecting your family.