How long is too long to wait for a dog to whelp before you should take her to a vet?

Hello,

I have a toy pomeranian that has had 3 litters in the past.Her first litter she did fine.The 2nd litter at first everything was fine than after what we thought was everythings fine, she had a puppy still in her.She didn't act like she was in stress but I coud hear the puppys heart beat, so I was getting concerned that if after the next 17 hours went by and she still hadn't had it we would take her to the vet.So thats what we did.The vet we took her to,wasn't into deliverying puppies,but we didn't know this at the time,so we went to her.She examined my dog and said yes there's a puppy in there.So they gave her a shot to see if it would help, mher to finish helping her to have her puppies.She started labor pains again, but she just couldn't get it out,after close to a hour she came out and said she was going to give her a sedative and see if she could turn it or something.She had no luck, so she took her into surgey for a c section 'her nurse came out and said that the puppy was large and dead, but behind it was a smaler one that she was trying to bring back.It was a little fighter.She though said you see what you can do,cause I can't stay with it,Ikeep stimulating it ,sorta making it mad, til i got it to crying and fussing louder & louder .Believe it or not,that little fellow lived.The people that bought him from me said he is the most beautiful puppy.He's a year old this year.They said he weighs 4 pounds.Their suppose to send me pictures soon I hope they do.

Sorry about that I got off the subject, she is pregant today.It has been a total of 63 days.How long is to long to wait to take her to the vet? She has been acting like she is in labor for over 48 hours.But nothing is happening.I know nature can take its course but is it ok to wait over 63 day's.Her fever has been low, than goes up, yesterday i thought she was going to have them,and she had a fever of 101b so I knew she wasn't.How low does it need to be when they deffintly go in? Would giving her a warm bath might help"?.You know to relax the muscles.It was just a thought.Please get back with me as soon as you can, I love her very much,and my husband thinks I am a worry wort.I just don't want to loose her.

Thanks,
Janet