A high ANA generally means some sort of inflammatory disorder, but there are several besides Lupus that fall in that category. They are often distinguishable only by symptoms, and often the treatment is close to the same.
These kinds of illnesses are generally diagnosed by rheumatologists, so the consult is a great idea.
You might want to look at the 11 symptoms that help diagnose lupus, as found on the lupus org website (first link in my signature). A 10-yr old might have symptoms that she doesn't realize are symptoms, so you may need to ask more questions about
how she feels to gather enough symptoms for diagnosis.
Hope she feels better soon,
Lynnwood, Lupus & Sjogren's ModeratorDIAGNOSING-LUPUS & LUPUS-RESOURCES
"Life is far too important to be taken seriously" - Oscar Wilde