
Beth bitches don't have a menapause, so could still ahve pups at any age, but as with people the older the body gets the harder it is for the body to cope with the hard work of giving birth and rearing pups.
I would want the bitch scanned, as her pups if she is pregnant would be due at the weekend, and if she doesn't go into labour it could be inertia, due to ehr body being unable to get labour under way.
You really need to know one way or another,a dn be prepared for a possible C section, even if labour does start, as if the litter is small the chances are that with her less flexible bones she will ahve great difficulty passing large pups.
A scan this late should be able to tell the vet the relative size, number and health of the pups.