I've had MANY females soak between ovulation and pre-lay shed. Not sure what breeding guide you are using, but from over the 100 ball python clutches I've hatched, I've seen quite a bit of pre lay shed soaking...
I stop pairing females when follicles are at 30mm. This female is done.. Plain and simple.
You should be able to palpate and feel any follicles over 20mm, without the use of an ultrasound or even visually see when a female is done, much as the OP has described the behavior this female is presenting.
My guess is she probably has a pink belly, and is heading into a shed cycle.... Just a hunch there... Keep us posted OP.