Thank you so much for your quick reply and appreciate your concern. We are currently seeing Dr. Simon Oh in Denver who is really good and diagnosed her with SFN. But we have no underlying cause determination as most of the tests except the ACHR has come out negative. I would like to get a second opinion and will give the UC Health a try to see if they can do some further diagnosis. She did have higher level of B6 and low B12 which has been corrected now. I will definitely keep you and others posted just in case it is useful for others. Thank you so much.