Final answer:
The inquiry is about an idea Millie had for herself and Annie involving lanyards, but necessary details are missing. It seems Millie might have wanted to collaborate on a craft project making lanyards with Annie.
Step-by-step explanation:
The question seems to be missing critical information regarding Millie and Annie's specific idea involving lanyard's; however, based on the context provided, we can infer that the student might be asking about a creative project or activity that Millie might have had in mind to do with Annie involving lanyards. Since the provided story about Jane Career does not directly relate to Millie and Annie's situation, it's not possible to answer the question with certainty. Nonetheless, if Millie learned to make lanyards at camp, her idea for herself and Annie might have been to create lanyards together as a craft project, perhaps for fun, as gifts, or even as a fundraising activity for a school club or charity.