She didn’t abort the child - the child died. All things in God’s plans aren’t sweet and rosy. The child miscarrying wasn’t her plan... Bad things happen - and as the cliche says - sometimes to good people. I didn’t see the show you’re talking about but on the face of it - having mixed feelings about such an event can be an emotional saving grace.
If you can't see the symbolism in what the writers did the last two episodes - Sarah has a miscarriage and then afterwards is GLAD!!! that she lost her baby - then you're blind to the culture war [which, by the way, we lost some time ago - and, quite frankly, your inability to realize what's going on here is all the proof that anyone should ever need to realize that we lost the culture war].