what comes naturally are validating statements ("I understand you felt bad when she said that.".
That's a great place to start. I always start with the validating statements.
Perhaps I could try questions like "How will you greet her tomorrow?" or "Is there smth you could do differently?" or "Have you asked Y (a friend with kids in same kindergarten) for advice?".
Those are great questions. I would use the "Could you do something differently" later in the conversation though. Too early and it could trigger her into thinking you are putting all the blame on her. Some other easier ones are "How did that make you feel? or "How did you react to her saying that?"
The purpose of the validating questions is two fold
1. It shows that you are truly interested in hearing what she has to say so she feels supported and listened to.
2. Since she now feels supported and listened to, she gets out of emotion mind and can start focusing on wisemind. I've found that often just a few questions gets my H actually thinking about his own irrational thinking. Other times his solutions are not really good solutions, but it does get him out of the emotion.
Trouble is that BPDw thinks that there is one woman who doesn't like her because of dislike of foreigners/problems with understanding foreign accents, causing BPDw to "hit back" through body language, and BPDw thinks this one key woman then tells the other staff.
Questions for her on this topic: How do you know she tells others? Have you heard her do it? Did someone tell you she did this?
The ideal way out I guess is if there is someone else in BPDw's peer group (in this case, parents with kids in same kindergarten) who appears even more foreign (because of accent or physical features) and suggest to confer with them. But perhaps I am too rational about it?
This might help. It could get her to ask someone else's opinion on the situation. Or it could backfire and start triangulation with that other person and the perceived persecutor. At least if she sees that there is another person of a different ethnic background she may at least feel like there is someone "like her" so she can have a true peer.
Btw, what is your advice about where/when/how to read Stop Walking on Egg-Shells?
Reading in your office is a good idea if you can't read at home. Amazon has a kindle app that you can put right on your phone to read ebooks, but if you both have access to the same account, she could see the ebooks purchase.
I have not read Stop Walking on Egg Shells but if I were and he saw me reading it, I would say:
I know that when I withdraw when we have an argument it causes you to feel rejected and I don't want to feel like I don't care about you. I'm reading this book so that I can learn how to communicate better with you when we have conflict and be a better wife. (In the past when he has seen me reading similar type books I have said the same and he easily accepted this reasoning.)