Raise the ambient temps to around 88F and watch her to see if it gets worse. If you see any mucous or discharge from her nose or mouth or she sits with her head up like stargazing or with her mouth cracked open, then its time for a call to the vet.
As for checking for RI, a vet can take a mouth culture to find out if and what the exact bacteria, fungal or viral "bug" is as well what it is most susceptible to.
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