Who says that an 'average female' should be eating 2000 cal a day?
Ignore all that nonsense you may read. First of all, none of us are 'average.' I happen to be 70 years old, 146 lbs, and hypothyroid. If I ate 1500 cal a day, I'd gain rapidly. Most women I know who are your size eat 1200-1800 cal a day; it all depends on the individual.
If you're not hungry, don't eat! If you find yourself losing or gaining weight, that's the time to check on your calories. But if you're not hungry and maintaining your weight, just enjoy your primal eating.