hello, your mother‘s blood sugar is too high, and it seems her doctor is not agressive in managing it.
Is your mother following a low carb diet？ Low carb diet can.helo reduce insulin requirements. Other than this, her insulin doses may need to be increased.
Hi. there is no upper limit to how much insulin. The correct amount is whatever it takes to control her blood sugar. suggest she has to increase insulin dose. is she on basal-bolus, or mixed insulin. Basal-bolus gives more,flexible control.
glad to hear she is using low carb as part of management.
has she been tested in case she is type 1 diabetes? This can happen even in adults.