I am so sorry Natalie is sick....
Natalie's labored breathing is from the congestion pressing against her lungs. This tends to be worse when laying down. You may want to hold her upright to help with her breathing.
The dog cardiologist here has a long wait on their appointment schedule too, however, patients presently hospitalized at a vet's office...are seen more quickly. Perhaps your vet could make your referral?
Blessings sent for baby Natalie...
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