Heinous, vile, and backward as I find abortion to be, I don't like the idea of one state enforcing their laws on someone who was in another state with different laws. I think that's a legitimate place for the Federal government to step in. That said, I'll withhold my personal moral panic for when a DA actually starts going after a woman for killing her baby in a state in which it is legal to do so, or when a state law authorizing such a prosecution becomes a serious possibility.
This particular argument strikes me as similar to the feigned concern by pro-abortion advocates about cases of rape or incest. That is to say, the extreme edge case (and in this case entirely speculative) Motte used whenever there is pushback on the much less palatable Bailey of wanting women to be able to kill their baby for any reason at any time.