Most of us use Dr. Bishop's protocol, which calls for 30 mg per pound of body weight per day, divided into 3-4 doses throughout the day. Our family uses the Theranaturals brand of GSH (http://www.theranaturals.com ). Our family gives most daily doses oral, with one inhaled.
I'm sure many will tell you their own approach, and then you can decide what's right for you and your daughter.
Nice to have you with us!