Hi. Sounds like she should get back to the doctor, or any competent doctor. This might be diabetes or med related - or it might be something completely unrelated. It's not a classic or typical issue.
A change in insulin and diet can take some tweaking and changes to get right. What are some examples of her blood sugar levels at the moment? Perhaps she is suffering from dangerously high blood sugar levels. This can really impact on the body in a number of ways. The final result of escalating blood sugars can be disastrous.
If that is the reason for these issues, it doesn't change the urgency to get to a doctor ASAP, just as if not more urgent. Good luck with it.