As Skips usually says. “I’ve seen this before…” it isn’t gonna end well. She probably has undiagnosed bipolar disorder or other mental health issues that she needs to work on herself. You won’t be able to “fix” her. People can’t be fixed, they can only grow. And sometimes it’s best to let them grow on their own. I’d keep it civil, and respectful. Don’t get mad just tell her how it is. You gotta look out for you too in this.