I hope she responds professionally as you are handling it professionally. One thing I've learned quickly in this business is things go so much better when you own up to your mistake, even if you don't do it by setting out to hurt someone, it may be a laps in judgement, or honest mistake in not realizing the rules, but if she owns up to her "mistake" then it will get her so much further in the business world.
And if not, these ladies here will hunt her down! I love it, I love this community, I'd want you gals in my back pocket for any throw down!
Not because you're tough or bullies or being mean like some may think but because you are about fair, right, and protecting. I just heart you all.