Is there any unharmful way to help my dog into labor?

I have a pregnant Boston Terrier. She's 66 (almost 67) days along now. Her vet says he is giving it 2 more days then it's c section time. No signs of labor at all. She's huge and has all her milk and vet said she's even dialated. I know my date of breeding is exact. I've done short walks 3 times a day with her and 3 different baths. Is there anything (unharmful) that I'm not thinking of that could possibly help her into labor? I really would like her to do this naturally and not have to need a c section. This is her second litter. First was easy breezy. She's 3 years old.