Women are supposed to be higher mate. Aside from the obvious breasts they need extra fat to assist with things like getting pregnant. All the same, just tell her the equivalent of 20% for her is about 26% for a guy.
Is she lifting and doing cardio?
Don't be afraid to drop her carbs later in the day, you can always sub in a few extra g's of protein. I like the 1300cals. As RC says, try it and adjust accordingly.