I know it's hard to look at those numbers ... it's quite nerve wracking for some reason but as the others have said, it's just one number on one day. I know of a friend whose DS didn't make the gifted range in K or 1st grade but scored PG+ in 3rd grade on the WICIV. She trusted her instincts and had him retested and those scores explained everything. listen to your gut.
What test did your DD take? With the WISCIV, you can remove WMI and PSI to calculate the GAI if those indices pulled the score down. I think you need a 23pt difference between indices to use that calculation.
