She’s got to go back. Even if the USA was Mexico’s ER, this isn’t an emergency. Ship her back as soon as she goes into labor. No child murder, no anchor baby.
Or maybe that is how to prevent the creation of “anchor babies” - abort the fetus within the undocumented and other foreign national females who arrive in this country pregnant or become pregnant while on US soil.
Draconian, to be sure. But it would put an end to “citizenship tourism” in pretty short order.