Even if the complaint is logged to the campus' Panhellenic Council, what kind of trouble would the Rho Chi get into?
Rush is over and she's no longer a Rho Chi. That's a horrible thing to have to go through for the PNM, but I imagine there won't be any consequences for the Rho Chi who didn't give the courtesy call to the OP's PNM.
Assuming the Rho Chi received the correct information...