Help, Please! I can not get into ketosis!

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Hi. I am am a 54 yr old woman needing to lose 30 to 40 lbs. I followed a strict keto diet for 40 days losing 9 lbs the first 2 weeks then plateauing. At day 40 I was advised to break the diet for one day then restart with Atkins, I am now on day 4 of Atkins. During these weeks I have tested my blood and have never gotten above .5. I am presently at .3. I have logged every bite entering my mouth. Myfitnesspal is set to 20 grams carbs, 100 gram fat and 80 gram protein (protein is the only category I occasionally go over, but not by much). My calories have been between 1200 and 1400. Does anyone have any idea why I can not get into ketosis? I am baffled and becoming frustrated. I did Atkins about 15 years ago and had no problem getting into ketosis.