Reverse Sneeze or Tracheal Collapse?

I took my beautiful 1 year, 10 month old Morkie (or maybe she is a Maltipoo) to the Vet, because she was doing what I show in the video. The Vet did not do an X-Ray, but stated that my dog has a collapsed trachea. My question is... isn’t she too young to show visible symptoms? Can the vet be wrong (hopefully!) and my dog is actually reverse sneezing? Any help would be greatly appreciated, especially from any Vets. I am so heart broken by the diagnosis at such a young age. Can I maybe give her some calcium t