In another comment, oskarth posits that she "did everything right" by not going to her supervisor, so as to avoid "turning it into drama".
How does this not turn it into drama? Isn't that what supervisors are for? I understand the inclination to avoid being the snitch, but all this does is set her up for equally serious rebukement by management if and when it does get escalated there, and prevents her from having a leg to stand on.
Whether or not it is as offensive as the other, I think we all know that it was intended to be at least as annoying.
What she's effectively done is the digital equivalent to "I'm not touching you. I'm not touching you." while holding her finger one inch from the face of her co-workers. That's fine and dandy, but she doesn't get to respond like a two year old and also expect me to think highly of her actions.