Hi Delly,
the combination of BPD with alcohol is truly terrible. The alcohol lowers the respect for boundaries and confuses the emotional regulation. Rage is all too often the result.
For when she is sober - check out the LESSONS. The way you communicate with her matters often a lot more than what you communicate. Small changes make a difference, see the workshops on validation (pointers in the LESSONS). Also check the material on boundaries. You can't control her but you can control yourself - step out, leave or take other measures to protect yourself.
Dealing with alcohol is very tough and you may need support. AA is an organisation that also cares for partners of the addict. Consider reaching out to them for support on that end.
Last but not least

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a0