Two points. First, it is not uncommon for those of us who use pumps to have those pumps removed in cases when we night have a cognitive impairment. So this is not uncommon.
Second, it is also common and not unwise to allow a person's blood sugar to run a bit higher as they age. In the last 3 years, the American Diabetes Association has suggested that people who are older than 70 should have an A1C greater than 7 or eAG of 8.6.
The reason for the loosening of control is that it is thought that tight control may be dangerous and looser control is not likely overly harmful.
You did not say that your aunt is over 70 (I understand), but those observations might provide some context to the approach.