Lets try looking at it from the perspective presented by the Catechism of the Catholic Church.
The Catechism says rape is an instrinsically evil act and that a person who rapes someone often marks their victim for life:
This passage of the Catechism is found under the subtitles...
* CHAPTER TWO
"YOU SHALL LOVE YOUR NEIGHBOR AS YOURSELF"
THE SIXTH COMMANDMENT
You shall not commit adultery.113
You have heard that it was said, "You shall *
CCC ; 2356
Rape is the forcible violation of the sexual intimacy of another person. It does injury to justice and charity. Rape deeply wounds the respect, freedom, and physical and moral integrity to which every person has a right. It causes grave damage that can mark the victim for life. It is always an intrinsically evil act. Graver still is the rape of children committed by parents (incest) or those responsible for the education of the children entrusted to them.
Now the Catechism's main thrust on abortion (although still under the heading "*YOU SHALL LOVE YOUR NEIGHBOR AS YOURSELF") * , is categorized under the Fifth Commandment :
*THE FIFTH COMMANDMENT
You shall not kill.54
You have heard that it was said to the men of old, "You shall not kill: and whoever kills shall be liable to judgment." But I say to you that every one who is angry with his brother shall be liable to judgment.55 *
CCC ; 2270-2272
2270 Human life must be respected and protected absolutely from the moment of conception. From the first moment of his existence, a human being must be recognized as having the rights of a person - among which is the inviolable right of every innocent being to life.72
Before I formed you in the womb I knew you, and before you were born I consecrated you.73
My frame was not hidden from you, when I was being made in secret, intricately wrought in the depths of the earth.74
2271 Since the first century the Church has affirmed the moral evil of every procured abortion. This teaching has not changed and remains unchangeable. Direct abortion, that is to say, abortion willed either as an end or a means, is gravely contrary to the moral law:
You shall not kill the embryo by abortion and shall not cause the newborn to perish.75
God, the Lord of life, has entrusted to men the noble mission of safeguarding life, and men must carry it out in a manner worthy of themselves. Life must be protected with the utmost care from the moment of conception: abortion and infanticide are abominable crimes.76
2272 Formal cooperation in an abortion constitutes a grave offense. The Church attaches the canonical penalty of excommunication to this crime against human life. "A person who procures a completed abortion incurs excommunication latae sententiae,"77 "by the very commission of the offense,"78 and subject to the conditions provided by Canon Law.79 The Church does not thereby intend to restrict the scope of mercy. Rather, she makes clear the gravity of the crime committed, the irreparable harm done to the innocent who is put to death, as well as to the parents and the whole of society.
This last part - " ...the irreparable harm done to the innocent who is put to death, as well as to the parents and the whole of society" , is essentially saying that by providing/procuring an abortion for the 9 year old girl, you would be marking her a second time for life.
I know several people who have had abortions and I assure you, for these people, the abortion does not somehow "go away" once they've made the baby "go away".
One finds in the ensuing sections 2273-2275 of the Catechism vatican.va/archive/ccc_css/archive/catechism/p3s2c2a5.htm , a brief continuation of the explanation how abortion attacks the very origins of our existence and our right to exist.
These two things - rape and abortion both offend charity and justice, but they differ insofar as which Commandment has been transgressed - they aren't really up for comparison or to be contrasted against each other.