Hi,
I'm sorry to hear that your girl is having this issue. There are several things that may be causing this. Kennel cough/respiratory infections are a common culprit as are dental infections (Chihuahuas tend to be prone to these). Additioanlly, the breed can be prone to something called tracheal collapse. This can produce a cough and is often managed with steroids when it flares, harnesses instead of collars, and avoiding strenuous activity. It would be advisable to err on the side of caution and have her seen. I hope she's doing better soon.
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Sorry for the delay. Kennel cough/infection can be contracted even if direct contact with other dogs was not made. As for dental issues, in some cases these may cause coughing but not congestion. This may be able to be treated with a short corse of antibiotics as prescribed by your vet. I hope she's feeling better soon.
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