And note that Jane's entry item was the tree - what did she actually need to even do to it?
John's was actually the apple.
I'm not sure we know enough to be sure she didn't do... whatever she needed to do.
I think that a prototyping might be required for the entry item to be created. If we look at both John's and Jade's items, the tree had no role but to sprout the actual entry item, the apple and pinata respectively.
The disappearance of her house seemed weird though. Perhaps the game has fail safes to give a player that has successfully created their entry item, but did not prototype a chance to correct that mistake?
EDIT: It seems that I've been proved wrong already. I guess that's what happens when I am too impatient to just read the rest of the page before posting...