This change isn't to make doctor-facilitated abortion on demand legal at all stages, but to decriminalise a legislative inconsistency where a pregnant woman can legally chain-smoke, drink like a fish, eat unpasteurised cheese, and take heroin without being criminalised for harming her baby, but can't take two very specific tablets without being criminalised.
It being the case that once out of the womb the typical jury will say - “Go to prison you evil murderess” to a very young girl who has killed the baby she had just had alone in the night after having hidden/denied it).
Once born, breathing, and no longer reliant on a specific person for life support, that baby can be looked after by anyone willing to step up. We rightly have State-provided services for dealing with cases of mothers relinquishing children. It's rightly deemed murder when a child has an existence independant of his or her mother.
I would hope that, in the specific example you give, the investigation would also ask how a "very young girl" came to be pregnant and avoiding prenatal care in the first place and that the judge would consider her age and the fact that she has been raped underage, possibly incestuously, as mitigation when sentencing.
Every single abortion starts with a man or boy putting his dick into a woman or girl. Every single one.