Of course! Here’s a heartfelt message you can share with your sister for her defense:
"Dear [Sister's Name],
As you prepare for your defense, I want you to know how incredibly proud I am of you. You've worked so hard to reach this moment, and I have every confidence in your abilities. Remember to breathe, stay calm, and trust in the knowledge and passion that got you here. No matter the outcome, you are already a success in my eyes. Good luck—you’ve got this!
With all my love,
[Your Name]"
Feel free to personalize it further if you’d like!