I got into DKA while wearing a cgm. I ripped my pump off at some point during a Friday night in November 2016, by the Saturday morning I was too hyperglycaemic and confused to realise the pump wasn't attached/test my blood sugar/pay any attention to the cgm alarming. I then didn't move, eat or inject until the Sunday evening (I'm pretty sure I was having auditory hallucinations) when my parents got hold of me on the phone - they couldn't get any sense out of me and an ambulance was called. Once I'd spoken to my parents I realised something was wrong, resisted a my pump, tested my sugar and gave a correction dose along with increased TBR. My blood sugar wasn't that high, around 18, and I usually have some trace ketones because I don't eat much carbs, but by the time I got admitted to A&E (around 8pm on the Sunday evening) I was properly acidotic, and I had a raised WCC and CRP from the shock of going into acidosis, I think, but obviously HCPs were keen to check for UTI chest X-ray etc.
So, on a pump with no fast acting insulin you can go into DKA overnight.
As a honeymooning type 1, I would be very cautious about stopping taking your insuli without guidance from your treating endocrinologist. You aren't misdiagnosed. Your daughter has type 1. You have type 1. It's not that uncommon for a type 1 diagnosed at an older age to have a long, strong honeymoon period. It can come on a few weeks months after diagnosis and commencing insulin. The beta cells have had a bit of a rest, they get a second wind, they are producing enough insulin to keep you going. The immune system of an older person isn't necessarily that efficient, so once your immune system has decided to kill off your beta cells, it can take a while. But it will still keep killing them off one by one until they all dead and you need the insulin. If you want to extend the honeymoon period it is thought that you do better to keep taking very low doses of insulin, so as not to over stretch the dying off beta cells.
As a honeymooning type 1, keeping a close eye on blood sugar levels you are less likely to end up in DKA. But do make sure to keep a close eye on blood sugar levels, if they sit in double figure for and extended period consider taking your insulin.