If it were me, I would write a letter to your Judiciary Board/Executive Board (whoever handles problems within the chapter) and tell them about the problems you've experienced with this sister. Cite specific examples and include any evidence to her behavior that you have (the e-mail, for example).
Make sure that your letter comes across as mature and respectful instead of spiteful so that the sisters reading it will understand that you are writing, not to cause trouble for this sister, but to hopefully come up with a way to make her aware of the problem and, as a result, make the chapter stronger.
Good luck! Keep us updated!
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