I've been looking for an update on this one! Is she still laying inverted like those pics?
I haven't done any breeding myself yet (next season!), but my reason to be concerned would be not so much the number of days, but how long she's looked like she should go any day. I think Heather posted 3 days tops, and that was about a week ago.
I vaguely remember reading about being able to test if a female is eggbound by lifting her up by her tail and seeing if the eggs move up and down her body or not. DO NOT DO THIS BASED ON MY POST! But it might be worth looking into or asking some of the more knowledgeable breeders?