There are a few possible conditions which may affect a new mother a few weeks after queening which may include eclampsia, infections among other conditions which may lead to difficulty in walking and breathing. Since Noor is still nursing her kittens, you should take her to your Veterinarian for an examination (good to take the kittens too as separation may stress her) and see what they find with an examination and blood test. Regards Dr Callum Turner DVM
There are various causes for rapid breathing with pain being a common cause; infections, foreign bodies, heart conditions, allergies among other conditions may also cause rapid breathing. It may be worth trying to get Possum into the bathroom whilst you take a shower to see if the warm humid air helps to open her airway; otherwise we are a little bit stuck for a cause. If the cause was due to a blocked nose, your Veterinarian would have detected that on the physical examination. Regards Dr Callum Turner DVM
Black ticked tabby Chausies have black ticking, black stripes on the inside of the upper legs and to a lesser extent on the outside, black rings on the tail, a black tail tip, and black tabby markings around the eyes. They are also known as brown ticked tabbies because, although the markings are black, the background color is brownish. The background color can vary in hue across a large range. While Chausie breeders try to avoid producing the very reddish brown background color seen in the Abyssinian breed, they do produce everything else in the range. Background color may be reddish gold, it may be a light golden brown, warm beige, cold beige, and even a very cool light gray with just a hint of brown in it. The latter is a very wild looking background color. Random polygenes influence the background color. Every time a black ticked tabby kitten is born, breeders start guessing what the background color will be. But no one really knows until the cat matures.
Actually what you are seeing are the different color phases of a Bobcat. During the winter months, they are brown or brown grey. That is why Boris looks grey in the center picture, that was taken during the winter. All 3 are now orange or a brown/orange mix. Nakoma has the most orange on him as does Amber. Boris, since he is still a kitten, just a little over a year old, he still has a combination of orange and brown. Next summer he will be more orange.
Class clown — there’s always one! Purina notes that these confident and friendly creatures stand out because of their clowning around. These short-tailed cats, who were bred in the U.S. starting in the 1960s, according to TICA, make a great family pet since they’re sociable with humans of all ages and even other friends of the four-legged variety. They’re all about fun — but aren’t in need of your undivided attention — and don’t tend to attach themselves to one person.  
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

I cannot think of a connection between the running after another cat and the symptoms that she is presenting with except possibly hypoglycemia (normally causes an increase in appetite) due to the blood glucose level being too low. I would suggest to rub a little corn syrup or honey on the gums to see if there is any improvement in Cupcake’s symptoms; ensure you keep Cupcake hydrated and visit your Veterinarian on Monday morning, if the symptoms increase in severity visit an Emergency Veterinarian. Regards Dr Callum Turner DVM
The Russian blue is a sweet-tempered, loyal cat who will follow her owner everywhere, so don't be surprised if she greets you at the front door! While she has a tendency to attach to one pet parent in particular, she demonstrates affection with her whole family and demands it in return. It's said that Russian blues train their owners rather than the owners training them, a legend that's been proven true time and again.
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