It can be challenging to motivate someone who lacks drive and initiative. However, there are some strategies you can try to help your sister change her behavior and become more productive.

1. Help her set goals: Encourage your sister to set some achievable goals for herself. Start with small goals and gradually increase the difficulty level. This can help her gain a sense of accomplishment and motivate her to keep going.

2. Encourage her to find a hobby or activity she enjoys: Help your sister explore her interests and find something she enjoys doing. This could be anything from playing a musical instrument to volunteering at a local charity. Finding a hobby can help her feel more fulfilled and motivated.

3. Create a routine: Encourage your sister to create a daily routine that includes time for work, leisure, and self-care activities. Having a routine can help her feel more organized and motivated to stick to her daily tasks.

4. Lead by example: Be a good role model for your sister. Show her how to be productive and engaged in activities. If she sees you engaging in activities and taking care of yourself, she may be more likely to follow your lead.

5. Offer support: Let your sister know that you are there to support her. Encourage her to talk about her goals and feelings. Be positive and offer encouragement when she needs it.

6. Seek professional help: If your sister's lack of motivation is affecting her mental health or ability to function, encourage her to seek professional help. A therapist or counselor can help her work through any underlying issues that may be contributing to her lack of motivation.

Remember, change takes time and effort. Be patient with your sister and continue to offer support and encouragement. With time and persistence, she can overcome her lack of motivation and become more productive.