I don't like that this is framed as a morality question; isn't it more one of women's rights?
Accepting the (hugely game-changing) assumption that a fetus is sentient from conception on, then both mother and father are automatically in the wrong, for having caused a 9-month prison sentence upon an unwitting, sentient being. 9 months of, essentially, solitary confinement.
Even after as short a time as a few days, the effects of solitary on a sentient human can be devestating. Hallucinations, self-mutilation, suicidal depression, associative disorders, etc...
So, basically, the OP has put us NOT in a questioning of the morality of abortion, but rather in the sticky spot of deciding whether it's more morally permissible to be a jailor/torturer, or a killer.
Going by some of the highest standards accepted by the bulk of humanity (the Universal declaration of human rights; the Geneva convention), torture is actually LESS approved than killing. Look at the rules of war - it's fine to kill an enemy combatant, but POWs have basic rights against torture.
With that considered, it's not only morally permissible for the woman to terminate the pregnancy; it's a moral imperative to do so, as quickly as possible.