While it would be good to be told, you are making a huge deal over this. It's a failure, but that doesn't mean that she's going to die if she doesn't wake up. It doesn't even mean she's going to have any problems.
Reading your description of her insulin pump makes me think of how complicated that is and how much she is relying on the pump for rather than doing out herself. It looks like the pump is doing an incredible huge amount.
I'm young. I remember when insulin pumps really started getting popular. I don't remember how old I was, but I remember my dad's first pump. Before that he had no way to inject insulin overnight. However you also don't eat while you're asleep. Every pump that he has had up to 4 years ago has not monitored his blood sugar, has not reacted to his blood sugar, has not calculated out how much insulin he should be injecting. (Actually he tried a continuous monitoring solution around 4 years ago and it did not work because he had been giving himself injections for too long and it would not keep an accurate reading). It was a device which he could tell to give him insulin and it would do so without requiring 5-10 injections every day, only a replacement ever 3 days.
Yes, it is absolutely a failure. Yes it absolutely should tell you. But its not the life or death situation you're making it out to be, and truthfully anyone with diabetes should know the warning signs of too high and too low, should know how much insulin to give themselves with what they're eating, and so on. The pump is an amazingly useful tool, but it should be just that a tool, because situations arise when you can't use the pump. It just so happens that my dad personally survived with diabetes over 30 years without one.
This is probably somewhat offtopic for the discussion, but there's a huge difference between an implantable pacemarker. While they both are relied on, one is internal, one is external, and the failures of the insulin pump are very different when they cause too much insulin to be given and not enough. One is much more a life or death scenario while the other can be worked around using the means that was used for the past 90 years because over one night the lack of insulin isn't scary.