What specific things are you struggling with, like what kinds of things result in her dysregulating? Is it like seemingly innocuous conversations suddenly turning ugly? Is there a history with her being a difficult personality before she was in the military?
The lessons on the Improving Board can help give you background on understanding BPD and there are lessons on communication skills which can help reduce conflict. For us, is often not seeing the triggers. Maybe this can help to start:
How It Feels To Have BPDI look more to hearing how we can help.

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