I'm afraid that I can't offer much more assistance for Bella than what you have already done, without being able to see or examine her. If she has not had a trans-tracheal wash, that may be one test that can help determine the type of cells that are present in her lungs, and if the x-rays have not been evaluated by a specialist, that is another possibility, as your veterinarian should be able to send those x-rays to be evaluated further.
My cat developed rapid labored respirations a week ago, the vet diagnosed lung cancer and he also had bladder infection. On xray he had consolidated whitish area with scattered crystal like areas. He was given antibiotics for infection and a steroid injection the vet said to temporary help with the breathing but he said my pet did not have long to live. He is breathing less labored and his rate fluctuates between 60-80/min. question is could this be something else instead of cancer-fungal, parasite? I do feed stray cats and even though he is mainly indoor cat I do take him out when I'm outside and he has gone under shrubs and maybe has sniffed something?
Feeding tamed big cats raw fish, raw porkchops, raw beef or raw rabbit together in an enclosed space will activate love mode. They can either be fed the meat, or it can be dropped next to them. After being fed and paired together, love hearts will show around the breeding pair, and after around 5–10 minutes, a cub will be produced and the naming screen will appear.
There are several possible ways cats can develop pyothorax. In many cases, the initial cause may remain undetermined. Some causes include bite wounds, trauma, inhalation of an object such as a grass awn, bacteria ascending from the mouth, diffusion of bacterial infection, parasitic migration, perioperative aspiration, tumours, ruptured abscess and lung lobe torsion.
Diagnosis of rapid breathing in your cat will require your veterinarian to determine the underlying cause. This will involve diagnostic tests that may not seem related to breathing, such as blood work, urinalysis and other extensive systemic exams. Given the lengthy list of potential conditions, it will be important for you to provide your veterinarian with a thorough physical and medical history of your cat. If your cat is allowed outdoors, has recently suffered from a traumatic injury, or could potentially have fallen from a high surface, this will be important information to help identify potential trauma or pain. You should also provide your vet with a history of progression of symptoms such as approximate time of onset and any worsening or improvement. This will help your veterinarian narrow down potential causes.
If Squeakers is acting normally otherwise and doesn't seem to be having any respiratory distress, this may just be normal for her. If she hasn't had a checkup in a while, it would be a good idea to have her checked out, regardless, as a veterinarian can listen to her heart and lungs, and assess her general health and whether this breathing pattern is normal, or a potential problem. I hope that all goes well for her!