For me, I told myself that if I didn’t start studying, then I won’t get higher scores (causation, not correlation). I even had to write a motivational letter to myself to get myself going. I worked on my homework every night to make sure I allot 30-60 minutes to work on a section. This was before the redesigned test. But the method is the same—if your daughter doesn’t practice, she won’t be able to improve. She’s has to realize that her scores are dependent on her familiarity with the type of questions SAT asks, or else it may be too late.
It’s hard to sit down and start studying–I had to struggle through that as well–so maybe try a motivational/pep talk later that stresses the importance of practice and the consequences that stem from not practicing.
I would also make sure that even after you take a test section, make sure to REVIEW. Reviewing the mistakes, even the ones she guesses on, are important. Then she’ll understand what went wrong and to not bother with that again. Otherwise, she’s not learning from her mistakes to correct them later on.
After many practice tests, she’ll gain confidence and on test day, it’ll be much easier.