You must continue to use insulin. If you are fortunate to help her heal so that her body begins to make functional insulin you would at that time be able to reduce the dose and not until then. So it is important to monitor her blood glucose levels and communicate with your veterinarian so he or she can advise you on how to adjust the dosage.
There are some general guidelines that can help the process along. Feed your cat only canned cat food approved for diabetes such as Purina DM and no dry cat food. Give digestive enzymes with each meal, and probiotics and a fish oil supplement daily. Giving Dia-IonX helps the body better utilize the other supplements. The homeopathic ingredients in Dia-IonX help to control the symptoms of diabetes and help stimulate the body to heal. The goal is to regulate the diabetes well to try to protect the eyes and kidneys from damage. Sufficient water is important and make sure it is pure and fresh and is free of chlorine and fluoride. It is also helpful to provide regular exercise by encouraging her to play with her toys because it helps to move glucose from the blood and into the muscles. This all leads to better regulation. Please let us know how you do and if you have any other questions.