Liz I am in the same situation. I am the cookie mom and according to our troop leader I am responsible for the booth, cookies and money.
Here is my take on things. I see both sides of the situation. Last year our Troop Leader worked every booth and her DD was top seller because of that. She got to go to an award dinner and everything. I didn't think it was fair to the other girls who only worked certain time slots due to being able to only have a certain amount of girls at the booth at a time.
I DON'T plan to be at the booths at all times. I will open and close for sure and only work certain time slots. All of the other Moms have signed forms that state if they work a booth they are responsible for the money, booth and cookies during their time slots. It is a girl scout form so I would assume that it is right.
I will also cover any time slots that are not covered, after everyone had a chance to sign up.
that is just my 2 cents.