It would just be terrible if you took someones advice here and ended up with problems. You never know how much experience a person actually has, even if they talk like they do. I would go talk with your vet again. I would never take advice that is a matter of surgery, life or death from other list memebers or a forum. noone could no for sure what to do, anyway. Your dog may be different circumstances from the person who tells you that everything will work or visa versa, Ella's mom
How old is your dog? How close together are her litters? I would think if she got pregnant again, there'd be a much higher likelihood of having problems, especially if she got pregnant within even a year of having the c-section.