You have correctly identified one of the most maddening things about
auto-immune disease -- it doesn't have clear-cut definitive blood tests. The diagnosis by symptoms means it often takes a while before diagnosis.
Limbo can be agonizing. It is important to try to keep your head in "today" and try not to spend your energy on "what might happen". If something does come up, it will need your energy then!
Unless your daughter's symptoms become more regular or more severe, it isn't practical to retest sooner as you'd most likely get the same non-decisive results.
And even those of us who have been diagnosed have days when we think it all must be a cruel trick, as we feel good -- but inattention, missing meds, or doing too much and symptoms reappear. We all have to trust the experience and training of the Drs who are treating us.
Lynnwood, Lupus & Sjogren's ModeratorDIAGNOSING LUPUS & LUPUS RESOURCES
"Life is far too important to be taken seriously" - Oscar Wilde