You are taking the right approach by finding out your student’s level in the first class. It’s good to spend some time getting to know her and finding out her level, her strengths and her weaknesses.
In the Trinity exams, originally only spoken English was tested. There are 12 levels to the oral communication exam from initial to advanced. Trinity have now introduced exams at 3 levels that cover the 4 skills (speaking, listening, reading and writing). Would it be possible to check with your school which exams your student will be taking and to write in again?
You can also ask whether anybody at your school has taught this type of class before and what materials (s)he used. You might find that there is a good bank of materials available. You can also take a look at the Trinity website:
Please feel free to write in again.