How many calories should a 25 year old active female eat to lose
weight, Current weight approx 156lbs, exercise 30 mins - 1 hour per
day, work at a desk job and is know for her sweet tooth?

Depends what is your goal weight is.

It takes 3,500 calories to either gain or lose a pound. Keeping a
negative calorie balance is necessary.

Here is an easy way to figure the calories you need:
Take your "Goal" weight, divide it by 2.2 = (A)
(A) x 24 = (C)alories needed (to get to and maintain this weight without exercise.)

Multiply by 1.3% for your activity level. = Total Calories needed per
Day (with Exercise to get to and maintain goal weight.)

Make your calories count by eating high-fiber, low-processed foods. 
Stay away from sugary drinks.  Enjoy your sweets in moderation so you
don't feel deprived, but start to subsitute them with sweet fruits
such as berries, grapes and kiwi.  Keeping table sugar out of your
diet will help control your cravings for sweets and fruit is a great
replacement.  The more you do it....the more you'll do it.

Visit GetThatBody.com if you'd like more info.  Thx.

All of them.

You're waaaaaaay too fat

Poet