You are doing the right thing now by going to other doctors. Any doctor that is not concerned....well, I won't say what I am thinking.
MS does affect eyesight and that is often the earliest symptom. A neuro opthamologist can run tests and determine if MS is beginning to surface. MS runs in my ex wifes family and my son started having problems 2 years ago. He went to the specialists and they ran the tests and determined that he did not have MS. He is ever alert as he has a heritage of MS on one side of the family and MCTD (lupus, scleroderma and polymyositis) on mine.
Lupus can be very difficult to diagnose and many patients go years with various symptoms before getting a diagnosis. Check out the Lupus Foundation of America, Mayo Clinic and another site and look at the list of symptoms. Click on the links below to navigate to these sites.
Let us know what you find. I believe there is an MS forum on Healingwell that might have more answers for you if your daughter is diagnosed.
MCTD (lupus, scleroderma, polymyositis). Diagnosed 2005. Kidney, liver, GI tract, dysphagia, raynauds, Barretts esophagus, quadriplegic in 2005. Recovered and now active in skiing, tai, chi, hiking, golf. Meds: prednisone 2.5mg, imuran 50mg, amlodipine, benazapril, omeprazole, potassium, folic acid, vitamins, maxide and various supplements and vitamins.
Remain optimistic and you can overcome the odds.