St. Emerentiana was a young martyred catechumen (cf. Pohle-Preuss v. 1 p. 251).
Red herring. She was obviously put to death on account of being Christian. What's at issue is whether unborn babies who are killed largely indiscriminately, for reasons of personal selfishness or financial gain, could qualify as martyrs. I would imagine that there's maybe one case out of a million where the abortion doctor thinks, "Aha, I want to kill this baby because he's otherwise grow up to be a Christian." And exactly ZERO mothers subject their children to abortion because they don't want their child to become Christian ... for all they'd have to do is to raise them to think otherwise and to reject Christianity. So on all fronts applying BoB to aborted babies is an epic fail, an exercise in emotion-based pseudo-theology ... from where all anti-EENS thinking originates.