I think your quickest way to rule out something other than temps being too high is to simply lower the temps in her basking area and see if this stops or lessens.
My male panther does this when basking for a second or two. Sometimes a few seconds, but not really that often anymore. He used to do it more when I incorrectly had his basking area too high and as soon as I lowered it, I noticed a change (doing it less) immediately.