The obvious answer is that it's going to show her gal pal from their past lives, but I think it would be funny if it showed her past life's cat or something.

Or maybe she'll want to see her friend from her past life, but it shows Blue Hair instead.
Or maybe it's a fakeout.

D'aww

So this chapter pretty much confirms that Elsa understands at least some aspect of the villainess system

Probably not that much, but it does seem like Elsa suspects that something is going on with her.