So you are 5'3" and your goal calories are 1800 a day? I can't reach that goal either. I'm 5'3" and 135lbs. I tend to fall in the range of about 900+-1700 with 1700 being a day of generous eating and 900+ being a day of no appetite and a few missed meals (don't go there often, but I do sometimes go there). Remember, when you have a lot of body fat and your calories are low, your body will make up for any deficit by consuming body fat. I assume that is your true goal.
Female, 5'3", 49, Starting weight: 163lbs. Current weight: 135 (more or less).
I can squat 180lbs, press 72.5lbs and deadlift 185lbs