Just like with humans her moody behavior could probably be from being pregnant. Just like with humans I suppose it could change hormones and such.
She may be wimpering because of contractions and other abdominal pain associated with pregnancy.
Pregnancy is dogs usually last about 63 days. Like u said, when temperature drops below 100 degrees this is a sign of labor. From what I have read when a dog's temperature drops below 100 degrees this mean she will deliver within 24 hours in most cases. I'd just make sure to be prepared for her to deliver any time. She could possibly deliver within 24 hours even though she may not be showing other signs. Important thing here is to just be ready, possibly within 24 hours. Be prepared and everything should go fine. Whining is common in stage 1 of labor because of the contractions. You said she's been whining so this may be signs of stage 1 of labor. Sounds like she could very well be giving birth soon, within 24 hours so be ready. If she doesn't give birth within 24 hours with the temperature drop take her to the vet right away. Here's what I found online;
If the mother fails to go into labor within twenty-four hours after her body temperature drops to below 100F you should take the dog to a veterinarian. Do this also if you have calculated that more than 69 days have passed since the dog was bred.
Here's a link that discusses complications associated with labor and describes the various stages of labor so you'll be prepared.
I personally feel she is in fact in labor.
Good luck! I'm sure you must be excited.
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Dogs that chase cars have learned that cars run away. This behavior is reinforced each time he chases one away.
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