Actually, Plan B is NOT an abortion pill. If you check out the website, it states it is not one and will not terminate an existing pregnancy. If you do not want her to be pregnant you need to see a doctor. Self-abortion is extremely dangerous and should not be attempted. While there, you also should discuss birth control options with them.
If you have some type of a Plan B, she could take that. It is a pill that she could take which would cause her to miscarry the baby. If you do not have that as an option in Pakistan, then an abortion could be the best option since she he still very early in the pregnancy. The earlier in pregnancy, the better. I hope this helps you a little bit.