OMG they are the cutest at that age! Being off their mother too young has it's disadvantages both health and temper. Mom teaches them proper manners up until 3 months old. It helps shape a better temperament and they are not as into everything. I have raised 2 litters and I generally kept them until 3 moths old for that reason.

She may become a calm cat but you will have to wait a while, in not so long she's not going to be so cute! Generally around 2 years old they calm down a touch and become good little buddies. Getting them fixed so they can't have babies helps too.