When (if?) she does show up, can you talk to her honestly, about selling things being your role? And call her out on her rude behavior if need be? I work with all women, and unless you nip it in the bud by directly confronting the person involved, it will continue on and possibly escalate. Good Luck!
Calling out manipulators doesn't really work, because manipulators will just turn it around and blame you. Or at least a "good" manipulator...so if she IS a manipulator it might not work, but I suppose there is always the first attempt to figure that out. But yes, specifying roles would be important.
I guess see when she shows up for real.