Social, economic, emotional and medical considerations will all be relevant in different ways in different cases. The notion of responsibility is one such thing - which MacKenzie explores in her paper. Women have the burden of responsibility, but in our society where there is the option of abortion, they also have complete power and autonomy over this decision. The responsibility issue fleshes out our moral intuitions about why abortion after rape is morally justifiable - the woman should not be held to account for something she did not willingly bring about. But we should stop short of letting responsibility be a general criterion for the justification of abortion.
Irresponsibility is very common - is actually the norm for much sexual conduct.
This is excessive, and involves violating their rights in the way Margaret Little describes. There is another gap.