1.reward
Every time your sister writes, oh, 500 words on her masters essay, she should reward herself. How? I dunno. I nice dinner? Listening to Bach? Sleep late? Go for a swim? Whatever turns her crank
2.penalty
On any day should doesn’t do her assignment (is 500 words reasonable), she penalizes herself. No dessert? Set the alarm clock early? Whatever.
3.read this book:
Edelstein, Michael R. and David Ramsay Steele. 2019. Three Minute Therapy: Change Your Thinking, Change Your Life. San Francisco, CA: Gallatin House http://therebt.life/
Best regards,