Darth Vader #1

[fin5]

If that is who i think it is it would be the worst part of Star Wars
I wonder if Gorge Locus had a say in the comics

[Celgress]

There is no way it can be the real her, so I'm not worried.

[ChrisIII]

Given that the droid sees her as well in the preview for #2, I'm guessing she's not a hallucination.

Clone perhaps? Although I don't think we've seen cloning in the new canon outside of Jango and (presumabely) ROS Palpatine, the technology is established. One of the future comics will apparently visit Padme's tomb so maybe somebody got her genetic material.

She could also be perhaps one of the Queen's handmaiden/decoys, who of course closely resembled her. Maybe with some extra cosmetic surgery to complete the illusion. Could be Sabe (Keira Knightley's character). The Queen's Shadow book apparently has her trying to find out how Padme died, and maybe she thinks Vader has some answers.

[SuperiorIronman]

Kaminoan clones would be problematic because the facility would be shut down, but the Empire should still be there. You got infant Fett clones, child Fett clones, clones already going through the simulators, like even if they shut down the facility the facility still has 10 years of clones to work with. I got no idea how a Padme clone would slip by like that.

One of Padme's decoys probably.

[thwhtGuardian]

One of her decoys seems like the only plausible answer

[ChrisIII]

I don't think the Kaminoans have a monopoly on Clones. Obi-Wan's conservation with Dex seems to indicate that the technology is well known.