My 9 yr old girl gets too big for her britches when her friend is around (meaning a bit cranky n smartmouth?

Every kid goes through this, heck i remember going through it and my mom who is also a single parent would tell me the exact same thing. Just keep doing what your doing. It shows her who's boss so when shes a teen shes not mouthy. It just cuz she has a friend over, she has to be "cool"