Hello, I am Dr. Peter a licensed Veterinarian. I would like to help. I need to ask you a few questions to be well informed and give you the best advise. There is no additional charge for information request.
1- How is she walking?
2- Can you take a rectal temperature?
3- Take a look at her gums and see if they are pink like yours or pale?
4- Is she spayed?
Can you open her mouth and see if there is something stuck in her mouth, under the tongue, teeth, etc.
The symptoms your dog is exhibiting of shaking could be a sign of pain or a fever (infection). The pain can be either directly from musculoskeletal discomfort, abdominal pain or a systemic disease. Her symptoms are very non specific, if you have access to an ER veterinarian it may be a great idea to have her examined and not wait. Her symptoms could be related to something simple, but, it could also be more complex diseases that require immediate care. The only way of knowing is with a hands on exam.
If you have additional questions I will be glad to answer them.