The
kappa free light chain result should be repeated to establish a trend and I think also the
kappa/lambda ratio would be useful as it indicates activity, however, more diagnostic tests may be needed.
The 1:40 ANA is normal, considered negative up to 1:160, not useful for diagnostic purposes.
Her doctor is likely right.
Can you tell us more about her symptoms, dietary habits, fitness level,age, weight,etc, including brief med. history?