Zam Wessel is a shapeshifter. She's shown quite explicitly to be a shapeshifter in the movie. Anakin even warns Obi-Wan to be careful when going into the bar in the scenes preceding this one because they are following a shapeshifter.

You'd expect some cool plot-related points to revolve around the undeniably interesting fact that Zam is a shapeshifter.

Except when Zam sneaks up behind Obi-Wan in the bar, she's in the exact same human-like shape she was in when they were chasing her, and that Anakin saw. She completely fails to use her shapeshifting ability in any sort of attempt to disguise herself.

And then she dies in this scene, and quite clearly reveals her shapeshifting capability. Wow, there are shapeshifters in the Star Wars universe! We've been shown that fact quite explicitly. Surely this will become important later in the plot.

Only it never does. It's never mentioned again anywhere else in any of the movies. I think Anton Chekhov just committed suicide with his gun.

Transcript

GM: The shooter flies away.
Anakin: Quick, master, let's chase him!
GM: He's vanished; you didn't see which direction he went.
Obi-Wan: Anakin! We promised to take care of this woman. I... can't believe you did that.
Anakin: You promised. It was her or me. And we're the good guys, remember?
Zam Wessel: ... Please... look after... my son... {dies}
Anakin: A shapeshifter... We can't trust anyone now.
Obi-Wan: You can trust me.
Anakin: Of course, master.
Obi-Wan: What shapeshifting rules does this campaign use anyway?
GM: If you hadn't let her get killed, you might have found out.
Obi-Wan: Huh. What's this in her neck?
GM: It's just an ordinary metal dart. Probably poisoned.
Obi-Wan: Well there's our only clue.
GM: Good luck with that.
Obi-Wan: Why so grouchy?
R2-D2: I can see four pages of NPC backstory from here.