Thanks for your question on Healthcare Magic.
I can understand your concern.
They way you are describing your mother's breathing, possibility of chyne strokes breathing is more.
This is known as central breathing.
It is commonly seen with brain diseases and
sleep apnea.
So your mom there should definitely consult sleep specialist first and get done detailed sleep study.
She will also need detailed neurological examination and
MRI brain to rule out brain related diseases.
If she is
obese then she has too loose weight and stay fit and healthy.
CPAP (continuous
positive Airway pressure) machine will cure this breathing if it is due to sleep apnea.
So first diagnose her and them start appropriate treatment.
Hope I have solved your query. I will be happy to help you further. Wishing good health to your mother. Thanks.