Feeling sorry to say you but a girl candidate can not apply for the Indian Air Force after passing 12th. but don’t worry, you can apply for the Indian Air force after completing your graduation through the CDS examination. Following are the details of CDS examination:

Required qualification:
The applicant should have completed graduation with good academic record from any recognized university of India.

The CDS examination has following three stages:

WRITTEN EXAM
INTERVIEW
MEDICAL EXAM

So you need to wait till the completion of your graduation………………….