high ketones low

So ketones... If someones ketones are up and down for few weeks from 0.2 to 4.2 mmol/l and is thirsty, tired and sometimes nauseous could they be in dka? What should they do?

My wife had a 2.2 low last night which we got back to 7 after and hour and a half. Her sugars went upto 19 and have now stayed between 18&23 all morning despite constant corrections. I am thinking her body released some hormones following the low and we are currently battling against that...