Dear Sister Sadia,
The Qur'an is not silent on the issue of abortion. AWLAD = Children, born or unborn. Your friend's case seems to be a matter of convenience. Nothing pressing applies here such as HIV, maternal and fetal health or the trauma of rape.
17:31 Do not kill (AWLADAKUM) your children (nor deprive them of good rearing) for fear of poverty. We are the One Who provide for them as well as for you. Surely, killing them is a grave offense.
[Killing children = Slaying them = Depriving them of proper education and training = Rearing children callously. The Divine System will take responsibility of all your needs. 6:151, 9:111, 20:118]
BIRTH CONTROL & ABORTION
Ask any Mullah about birth control and there is good chance that he would declare it Haraam. He might present verse 6:151 as evidence but:
The Qur’an forbids KILLING of CHILDREN for fear of poverty.
6:151 — Neither kill your children for fear of poverty nor deprive them of proper training and education. We provide for you and for them —
Obviously, this includes abortion. As for contraception, there is no prohibition in the Book! Bukhari reports a Hadith. (Remember that no Hadith is authentic or infallible). When the noble companions asked the Prophet (S) about ‘Azl (coitus interruptus), he did not forbid that saying, “You may do so knowing that a child that is decreed to be born, will indeed be born.”
[Side note - Lane’s error: Edward Lane translates WALAD as an unborn child only. But it means any male child, born or unborn (Ref: Raghib). A female child is BINT. (Only in the 20th century we have become able to determine the fetal sex in-utero.) The plural AWLAD would apply to children, male or female as in progeny and offspring.]
As a rule, whenever the Qur’an avoids an explicit statement, it is not because Allah forgot to mention it. Rather, in His infinite Wisdom and Mercy, He left minor details open for human beings to decide according to changing times. He did not say: Do not kill MA FIL ARHAAM (what is in the wombs) since it could be a tumor, hydatid cyst or mole or a succumbed product of conception etc.