You took your little one over to W's mom's house(W is living there now) and you went in and gave them baths at you MIL place?
That seems strange to me. I understand you wanting to spend time with the kids but that's not the time nor place.
What I see, is your W not able to handle the situation,\ dinner, bath time , story time. what ever the evening ritual is for putting the kids to bed. What you did was rescue her from being inconvenienced. I'm sensing you want her to start convo with you. These are my thoughts. I could be wrong. It's just my perspective in the evening.
gr8
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