My daughter is taking the highest level of econ her high school offers after taking an intro level as an underclassman. (Her school does not offer the AP curriculum.) She intends to study econ in college, though, and is a recent admit to her top choice, which is a T10 school.
It’s really a matter of trade-offs. Will the AP Econ “crowd out” other AP options that will help demonstrate high academic rigor or help you gain admission for your desired major? Will taking a second econ course prevent you from covering other bases in math, the sciences or humanities?
If your counselor is concerned, for example, that you’ll skip APUSH or some other key subject, listen to her. Remember, she will be asked to score your curriculum choices in the Common App, and if a T30 school is your goal, you’ll want her to attest that you took the most rigorous course load available to you.