She should be due right now!!!!
Please don't tell me you haven't start researching....
And sound like you don't know who/how big is the father too!!! HORRIBLE REALLY!
And if the father is big, you will need c-section for sure to save your female so hope you got some saving!!!!!!!!
Here are 2 link with some good info on breeding.
Breeding, Whelping, and Rearing Puppies Breeding Dogs, Breeding, Reproducing, Showing
And I don't want to be rude but really. I am doing that JUST FOR THE DOG!!!
AND YOU SHOULD REALLY FIX HER RIGHT AFTER.