Very normal, as they get their plumbing all worked out.
I go out several times a day when my pullets begin to lay, to make sure they haven't left an egg in someplace it shouldn't be. If eggs are laying around in run or whatever, they are more likely to break them or peck them and get hooked on egg eating.
To help her figure out to lay in the nestbox, you ought to get a dummy egg to put in there (I use light or pastel colored plastic easter eggs and fill them with sand, although you can buy wooden or ceramic ones that are very realistic). I also don't let my pullets out to range until I'm sure that they've figured out to lay in the nest. That way they aren't hiding eggs from me, and when they are in a good pattern and I can let them out, they prefer to come back to the seclusion of the nestbox and do business there.
Don't worry, you may get another jelly egg or two, but she will soon outgrow it. Make sure you give her free-choice oyster shell for extra calcium. Good luck!