The estimated energy requirement (EER) for an adult woman (more than 19 years) can be calculated with the formula:
EER = 354 - (6.91×age) + PA×[(9.36×weight) + (726×height)]
where age is calculated in years, weight in kilograms and height in meters.
Therefore we need to transform the units of measurement:
5ft 3in = 1.60m
125lb = 56.7kg
The physical activity coefficient for an active adult woman is 1.27, therefore we have:
EER = 354 - (6.91×20) + 1.27×[(9.36×56.7) + (726×1.60)]
= 354 - 138.2 + 1.27×(530.712 + 1161.6)
= 2365 kcal/day
Therefore, the answer is: Mia's EER is 2365 kcal/day.