Should I ask her if she just wants to postpone the divorce?
I don't see anything in your post to indicate she's changing her mind. She'll tell you if she is thinking about postponing. Rest assured, she knows D isn't what you want. You don't need to remind her.
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Starting last night, this is the first week she'll be alone in the house b/c I have the girls. Maybe things will sink in.
I thought the same thing when my W moved out. Yet here we are a year later. What I've learned is that the W I knew before who placed her H and children before everything else and who lived for the family life is long gone and has been replaced with someone more interested in her own personal pursuits. Your W probably isn't the person you knew before BD, and she won't behave or react like that person anymore.