
Sorry but your friend is wrong
if she was mated on 13th Oct she would be due 15th December
and her last mating she wold be due 18th December
even these dates can be out a little as it doesnt mean the eggs were ripe
on these dates so YES your bitch can srill have her pups up to a week past
these dates.
Can you not get her scanned?
If you let people know where you are I am sure
they will put you in touch with a vet or person that can scan her.
You need to know even if its to get all the things you
need ready for her.