Diagnosis is sketchy especially early in the progression. Plus, there is a remitting form of MS in which a person may become asymptomatic for periods of time. Hopefully your friends had a wrong dx, or at least the relapsing/remitting form, which is more treatable than the straight progressive illness.
When my sister was diagnosed she was so weak she couldn’t even get out of bed if one of her big dogs was on the bed with her. Now she does anything she wants to do.
The co-worker said her church had a prayer session for her and it went away. When she went for her checkup the doctor couldn’t find any sign of it. I hope it doesn’t come back for either of them.