If she has no other symptoms I would be tempted to let things go, BUT...it was the rhuemy who suggested the ped rheumy, so you might go just to get a baseline and to find out what things you might watch out for...for instance, getting overly fatigued, staying out of the sun (it can trigger flares), other things like that.
She may already have symptoms that you aren't noticing as they are currently minor, but the ped's rheumy will know what to keep an eye out for and will know more about what is normal or not normal for a child that age -- something the rheumy you've already seen wouldn't be familiar with.
So my recommendation would be, YES, see the peds rheumy.
Lynnwood, Lupus & Sjogren's Moderator
"Life is far too important to be taken seriously" - Oscar Wilde