An increase in respiratory rate may be an indicator of pain especially if she is limping; without examining Isabella I cannot say whether this is due to pain or another cause (infection, heart disease etc…). I would restrict Isabella’s movements and monitor her for the time being but if it continues or the respiratory rate is above 40 breaths per minute you should visit your Veterinarian for an examination. Regards Dr Callum Turner DVM
My cat, Arwen, just came out to the living room limping badly with her front right leg kinda knuckling over. The leg and paw is cool to the touch in comparison to the rest of her body and her shoulder blade is just flat. I pinched her toes a little and there was no reaction. She's also breathing kind of shallow and fast with it seems like she's breathing from her stomach not her chest. She is crying a little bit but not when we touch the leg, onky when she tries to move around while laying down.

In one bit of Russian Blue lore, it’s said that the breed is a descendant of the royal felines kept by the Russian tsars. Contrary to that fun splash of folklore is the rumor that the Russian Blue cat actually originated on Northern Russia’s Archangel Isles (giving the breed the nickname Archangel Cat), where the breed was picked up by sailors in the 1800s and brought to Europe. And according to folklore, the Russian Blue is said to bring not just good luck but healing abilities, too!
This breed does not like change, preferring for things to be uniform and predictable. It can be thrown off when dinnertime is altered, and is nit-picky about hygiene. It will not even enter its litter box if it is dirty. In the early years, this breed developed a reputation at shows for being difficult to work with because of traits like these. The Russian Blue was gentle and happy at home, but at shows it was visibly discontent and temperamental. Popularity declined and fewer Russian Blues were being shown until breeders focused on improving the attitudes of the breed through selective breeding and behavior management (e.g., soft music, recording of show noises, crystals, herbal remedies). This commitment to the breed paid off, and today the Russian Blue is a happy participant at cat shows.
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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