Household chemicals are most likely getting a lot of use with all the cats she takes care of. Even if the ORANGE cleaner is used, her lungs are getting more exposure than they should. Cat urine and feces give off a lot of fumes (more lung strain) and kitty litter is often made with diatomaceous earth (there is a food grade, but even that should not be breathed for extended periods, LUNG ABUSE). Aspartame is also a cause of heart palpitations and is suspected of causing SUDDEN CARDIAC FAILURE (death). Aspartame does not make soda a health drink (even though society has been taught that the proper way to get healthy and lose weight is to drink SODA) and a reduction in calories is actually UNHEALTHY and has very little to do with actual weight loss (proper digestion and bowel movements will prevent bloating and retention of undigested food). She needs adequate ventilation in her house, ultimately less cats (maybe you could help with the cleaning, but wear a mask), NO aspartame, vegetable juices miracle healing (even V8 juice every day) and digestion enzymes (fiber also and adequate WATER). Read about garlic because she, no doubt, has circulatory problems, not just respiratory problems (blood circulation is affected by the amount of oxygen her lungs get).