It is certainly grave matter, FRiend.
Mortal sin also requires deliberate will and full knowledge. I don’t doubt that many who have had abortions or that procure abortions will have these as well.
Grave matter — abortion kills a baby; I will no longer be pregnant
Full knowledge — yes, I know it kills the baby and I won’t have to go through pregnancy or labor or birthing pains.
Deliberate consent — Yes, I sign the paper giving the abortionist my permission to perform the abortion.
To me, that makes it a mortal sin.