ip address 0.0.0.0 in access logs
If you go to Admin ➔ Security & Privacy ➔ Security & Sessions have you got 'require IP address' enabled? If so, disabling that should do the trick.
That said, rather than disabling security features, you would likely be better off looking into why her IP address is not being detected. The underlying problem is probably a local one rather than an issue with EE.