It's no surprise that such a stately cat has such royal roots, with its sleek, sophisticated demeanor. Although it was exhibited alongside other blue cats, by 1912, the Russian blue was given its own classification, points out Vetstreet, after its introduction to the United States in the early 1900s. However, says the CFA, the breed really took ahold of pet lovers' hearts after World War II, and it has been gaining popularity steadily since the 1960s.
I'm not sure, without seeing Lily, why her breathing is so elevated, whether it is pain, infection, or another trauma related incident. The antibiotic injection may help, or she may need further care, as she did go through a very traumatic event. If her breathing has not improved over the next 12-24 hours, it would be best to have a recheck for her - she may need tonging care until all of this is resolved.
Example a amazing Maine Coon can cost $1,200 (Parents HCM tested, fixed, shots, everything!) compared to a sickly Maine Coon (Parents not tested, no shots, not fixed and not pretty) post on a classified site that is $500. Some people blame the kitten mills, but the person to blame is some one funding those places. You can do the research, you can pick some one upholding proper ethics. 

Rapid breathing (tachypnea) is a respiratory disorder characterised by abnormal breathing that is rapid and shallow.  It is caused by a reduced level of oxygen, mechanical disorders (where the lungs aren’t able to expand as they should, usually due to a build-up of fluid in or around the lungs), and physiological disorders in which the cat’s respiratory centre in the brain is over stimulated.
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