As mentioned, she was pointing at illustrations in a book and this is the sarlacc page:
|Click to enlarge|
So somehow a sarlacc got from Tatooine to Wonderland - or the other way around. It also could be accessible via a portal to Tatooine.
Though we did hear the Star Wars theme as a ring tone in season two of Once Upon a Time, I believe this is the first occurrence that cements the connection and shows the world of Star Wars - or at least the creatures in it - is available to the fairy tale world. I don't know how to feel about this.