Group assignments

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In school i have a work assignment and we are supposed to entertain x amount of younger students by having a lesson for them, and we are supposed to make an educational game (with candy, nothing super difficult) about bacteria.
The problem is that some of my group members arent "bright" and dont understand why the math part is difficult (its about antibiotics, antibiotic resistant bacteria and normal bacteria).
The biggest problem though is that there is one group member who is in my personal space 90% of the time, and i dont know how to tell her to you know, not be?
The same girl does other stuff during the lesson as well, but does it where the rest of the group is working, and i just get drained of energy every time i have the lesson.

Any ideas to make group assignments in general easier?