Whiteness of toenail cover may be caused by many reasons, including malnutrition, blood loss, shock, hookworm disease, gastrointestinal bleeding, advanced tuberculosis and onychomycosis. Onychomycosis is a common nail infection, which initially manifests as white or yellowish brown spots under the tips of fingernails or toenails. If the girlfriend's situation belongs to one of these reasons, I suggest that she do her best.