And the kobold casts a portal spell on it: hold it just so and say 'kobold' to activate the portal, which goes to the cave she was experimenting in; hold it this other way and say 'kobold' a second time and it will close, or it will close on its own after ten minutes - watch your hands, but it'll close by shrinking rather than all at once, so there's some warning.

She should be able to check that spot a few times a day, though she can't guarantee it if she's busy or can't get away to read. (She's not sure yet how her tribe will react to that, but 'suspicious' is a reasonable assumption.)