She is sound of mind.

Interesting construct. I bet you in America people would say

She is of sound mind.

school she had got up and ready at the crack of dawn

More so what she did was practical - she bit the traffic as she drove to shool before the rush hour. )

Here's an American joke that suits a teenager coming to the age of freedom

A new doctor purchased a practice from the previous doctor who retired and with the energy of youth called out all the patients on the list for appointments.

One of the patients was an elderly lady. Going through the list of her medications and noticing a contraceptive, the doctor asked the lady

"For what purpose do you use this medicine?"

"This is my sleeping pill, doctor."

"This isn't a sleeping pill. You don't need it. I am going to discontinue this medicine."

"Oh, please doctor. I really need it. When my granddaughter is going to a party I disolve it to her orange juice and then I sleep like a baby."