Sorry that I saw this query just now and almost more than a fortnight since it was posted (I am new here!). I hope your mother is out of the acute physical disturbance by now and doing fine. The cause of her condition might have been food allergy
or food poisoning
. High sugars do warrant care. Being on insulin
does not mean her sugars will be always under control. Please make sure she undergoes thorough check up of her sugars at fasting, 2 hour post each meal and HbA1c
level to get an exact idea if the insulin doses are appropriate for her or need titration to optimize the sugar control. Good luck.