My 13 year old grandaughter was diagnosed with Lupus this past Mon..

She has been having pain in all of her joints, nausea, vertigo and fatigue.
She will be going to Riley Hospital in Indianapolis on June 19. I don't know exactly what kinds of tests will be done and neither does my daughter.

Could someone give me some detailed information about Lupus? I've done a lot of searches and have read about it but I still don't really understand what can happen to anyone who has it. Does it usually affect the vital body organ's?

Any info would be greatly appreciated.

Thank you very much.