In my opinion it is, but of course there will be people saying no. But I don't believe just taking all unwanted fetuses (meaning against their will) and putting them in artificial wombs, no. If she wants to or is okay with it, have at it.
It's a better option than killing them, but I think it should only be used in rare circumstances, or else we will end up re-enacting "Brave New World."
I believe it is better to let the unborn child grow in an artificial womb than to kill it.
I don't see why would anyone do such a thing.