Yes. Students staying in the girl hostels can definitely go outside the campus. But you have time restrictions. Girls can leave the hostels only after 6.30–7 am and have to come back by 7.30pm. There will attendance around 7.35pm to ensure all the students are back to their hostel blocks. But incase you have to leave the hostel at any time apart from the above mentioned timings, then you have to get a letter issued from your home or ask your guardians to talk over the phone with your warden. The warden then shall issue a permission letter which you have to flash at the gate to the guards. Only then you will be allowed to leave the hostel.
But incase you are a student of the AC hostels (like Meenakshi, Kalpana Chawla etc), your timings are flexible. You can enter as late as 8.30–9 pm.