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Hello and thank you for using this site to help you. I see that your question came in in the later evening hours when experts are a bit scarce. The shaking and panting is a sign of pain not of her being cold. Something is hurting though it would be impossible to say without an exam.
One thing to think about that can cause pain is a tick borne disease such as Lyme disease.
It could also be pain in the belly or joint pain .
YOu can watch her and see if it gets better unless other symptoms arrise such as any vomiting, diarrhea, fever etc. Check her gums and make sure they are pink and not white or pale.