I have all the symptoms your mother has. I am 52. I have POTS which causes the dizziness and passing out. I wear an abdominal binder that does help. I have only had a few passing out episodes since wearing this. I would suggest getting your mom compression socks or an abdominal binder. I have neuropathy, LC attacked my autonomic nervous system. I have horrible pain in my feet and hands and my right foot has CRPS - extreme neuropathy which causes horrible pain, swelling, changing colors (red or purple) - can't walk on it all the time. So I do not wear compression socks. I went through 3 years of countless doctor and testing before I ended up at the Long Covid Clinic. I would look to see if there are any near you. I still have issues, good days and bad, but they have helped me. Mentally it helps to have doctors who know you are sick and have plans of action. Everything LC triggered in me is incurable. I am learning to manage through medicine and physical therapy. I wish your mother good luck in this very difficult journey. I hope she can get the help and understanding she needs from a medical clinic. It is wonderful she has you and that you believe her and are looking for help.