I suggested it to WW to gauge response and she showed me the part about our separate living quarters in the separation agreement.
Not one single person here said to talk to her about it. Every person who told you to take back the MBR said to DO IT, not talk about it. If you had moved back in, no law officer would tell you to leave your own MBR because of some silly scrap of paper that is not legally binding. They only told you to abide by the agreement because their job is to keep the peace and they saw that as the best way to do it. They are NOT there to interpret civil disputes, that's what judges are for.
At this point I would not try to take it back or do ANYTHING other than maintain the status quo UNTIL you talk to a lawyer. And do that like YESTERDAY! Her calling the cops is a huge, huge red flag, she has put you on notice that the War of the Roses has now begun. You cannot reason with her, you can't negotiate with her, you can't deal with her at all except through the filter of a lawyer.
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I was shocked at her action. This is not the woman I married.
Doesn't shock me at all, have seen it several times. And you're right, she isn't who you married. She's a WW.