That is not too old. If "she" is not a "he" (and since you observed them mating they are probably a pair, then maybe they just need a little more time.
You should do a "google" search or search on this site, concerning "eggbound", and read up on it. Just in case.
You should do a "google" search or search on this site, concerning "eggbound", and read up on it. Just in case.