I would say yes she is in labor. Stage 1 can last from 6-24 hrs. My mom's temp drops to 97-98 and then I know it's time. ( not always the case )
When to call a vet
30-60 minutes of active straining without birth of a puppy
4 hrs between births with more pups expected
2 hrs of weak ineffectual labor without the birth of a pup
passing dark green or bloody fluid
before the birth of the first pup
I'm glad you called the vet to give them a heads up. You can also google stages of labor in dogs and get more info. good luck
