Mum who had a major crisis last week had 2 normal readings today. I njected 4.5 units of Caninsulin at 10 and her reading at around 4.30 pm Uk time was 5.6. Just tested at around 9 - and it was 6.4. Do I not inject tonight? Never happened before! I’ve given her some food and might re test later on? Suggestions?