Rottweiler 66 days pregnant!?

Our 3 year old dam is now 66 days pregnant with her first litter. We have consulted our vet & our breed mentor & they all say to give her a few more days to see if she whelps on her own. Everything seems normal to everyone, puppies are moving & active, Momma is happy & resting peacefully, no temp drop yet... Been checking every 4 hours like clockwork... The only big difference in her is today & yesterday she has been picking at her food & only really wanting the good food.. aka.. our food :) I guess I am just worried & anxious for her to have them. I appreciate any help or advice anyone could give... especially if this has something you have dealt with... Thanks so much! :)