We've already explained to you in the family class section of the forum repeatedly that you cannot sponsor her for PR - even if you adopt her - since her parents are still alive. If you insist on trying - no one can stop you. However the sponsorship is going to be refused. Once the refused sponsorship is on record, it will become much more difficult to obtain a study permit for her.
The only option available is a student visa. The first step will be to have a school in your area agree to take her on as a student. The next step is to apply for the study permit. You or her parents will have to demonstrate that you can pay for the $14K/year tuition + living expenses.
