My mother suffers of a sickness. I don't remember the name, but it's her immune system that attacks her myelin. Will a foot bath

An autoimmune disease that attacks the myelin sheaths might be Multiple Sclerosis.  Might this be her illness?  If you are asking if a foot bath can hurt or help her condition, it is unlikely that it will harm her, if it feels good to her.  It is also unlikely that it can make a real difference.  However, there are many treatments available which can give her relief of her symptoms, whatever they are.  Feel free to ask again with more detail so we can help.  Thanks!