My daughter 10 years old diagnosed with MS

Hi guys. My daughter is 10 years old and was recently diagnosed with MS. One doctor recommended waiting for another episode before treatment and another doctor is recommending treatment right away. Both recommended Rituximab infusion treatment plan. I understand once it's started, pretty much a lifetime treatment? The doctor is saying every 6 months infusion. But then if we don't start now and wait for another episode, the damage might not be worth the wait? What do you guys think? Thank you.

12/30 Update: Thank you guys for all the help. We've started her first Rituximab treatment and it went smoothly without any side effects or problems. However, after the treatment I've received a claim denial letter from our insurance Blue Cross Blue Shield! It looks like the neurologist spoke to the insurance doctor and it still got denied. We're very concerned now and not sure what to do. Has anyone run into this problem with their insurance? What should we do next? The insurance letter said the reason for denial is that Rituximab is off label and that we should try a FDA approved medicine and only try Rituximab if the treatment doesn't work or has side effects. This has been very stressful... having so much to worry about and now this.