Mucus membranes - flip her lip and look at the color of her gums. They should be a nice salmon pink color. If they are pale or dark red, definitely get her to the ER Vet tonight.
Capillary Refill time - this measures blood perfusion and test this by putting your thumb on her gum to apply pressure. After you release your thumb you will see the gum blanch. Capillary refill time is the amount of time it takes (in seconds) for the gum to return to a healthy pink color from the blanced white color. If 2 seconds or less don't worry - if it is taking significantly more time, again - off to the emergency Vet.
Respiratory Rate - if she is continuously panting throughout the night this is a sign of shock and or pain and a signal for a trip to the emergency Vet.
Best of luck with your girl and please keep an eye on her tonight. Get her to the Vet when you can if these symptoms persist or if more symptoms develop. Also be sure to check out: Canine Health a book I have helped write on canine health problems for future reference for your girl. I hope this helps and just reply if you need more info won't you! Please reply if you need any further help or assistance won't you.
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Dr M D Edwards