If a good and thoughtful student asked to have a copy of your work, you might agree because you feel that your work would be an academic collaboration, you would be cited properly, and they might have something to offer you in return.
If a mediocre/poor student asked to have a copy of your work, especially in the case of a lesson plan, you would tend not to agree because you feel like you are doing work for free for THEM (instead of for you learning how to make a lesson plan), you might feel like you wouldn't be credited and they would have nothing of value to swap in return.
So, like others, I would go to the professor ahead of time and say "As you pick new groups, I would like to request that I not be placed with Moochette. She does not exert the same effort as other classmates and wants us to hand over all of our hard work so she can modify it for her own use. I am all for collaborating with colleagues, but that assumes a give and take. She does not provide anything in return, but expects me to spend 3 hour copying all my work for her.
Also, I would help Moochette, but not the way she wants. You (and others) create good examples of lesson plans, and I do think sharing work is a good way for people to learn from each other which is part of the point of the presentations.
To Moochette: "Moochette, many hours have gone into finding all the clips and creating the drawings and I don't have the licenses for the clips to share with you and if you are going to create your own lesson plans you are going to need to learn AutoCad as well if you want those kind of drawings in the future.
What I will do is give you a paper copy of my PPT. It will show where the clips would go and diagrams would go and you are welcome to use it as a template for any future presentations you create.
So you are sharing, but not doing hardly any work!