The only rechitzah involved is that she wants to wipe her hands clean of the “problem”.
It’s a tragedy if someone is assaulted. Likewise, if someone gets robbed, it doesn’t entitle them to take someone else’s money.
The pregnant victim was wronged, but that has no bearing on her bearing a child. Don’t punish the child for the crimes of his father.
Such cases also account for less than 1% of abortions.