Maybe reach out with a brief facebook or text, like a sentence or two.
And then maybe reach out a second time a week or week and a half later, and then probably leave it at that.
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Of course, she still needs to treat you decently at works. The Yikes! factor where you loads you up with a bunch of task. I sometimes struggle with briefly and matter-of-factly standing up for myself.
Good luck and I wish for the outside chance where the two of you can re-establish your friendship.