Hello and thank you for your question.
Dogs can get laryngitis and bronchitis... so that is certainly a possiblity.
Given her age, you have to also consider that there could be an underlying heart condition contributing as well, esp if there is coughing and raspy breathing.
What kind of dog is she? Some breeds are more prone to having problems with their larynx... and can have changes in their voices due to problems with laryngeal weakness or paralysis.. esp labs.
An x-ray would identify if a bone is actually lodged somewhere, and a vet can also do a thorough exam to rule out an oral foreign body or bronchitis.
Is she actively coughing a lot or is it more raspy breathing and voice changes when barking...?
Given her breed and age, I am very suspicious about a possible problem with laryngeal paralysis. It often causes them to have a voice change, difficulty eating, and raspy breathing. Make sure you ask about this when you go. Bloodwork to rule out hypothyroidism is a good idea, too, because it can often be linked to laryngeal problems. There are medical and surgical treatments for this condition depending on the exact cause and the severity.
She also could have bronchitis or pharyngitis/laryngitis, which would be a more temporary problem.
Best of luck and let me know what your vet says!