We understand your distress and desire for God's intervention in this matter. Firstly, we want to assure you that God cares about every detail of our lives, including situations like these. Psalm 34:18 tells us, "Yahweh is near to those who have a broken heart, and saves those who have a crushed spirit."
Let's address your visa denial. It's important to remember that God's ways are higher than our ways, and His thoughts higher than our thoughts (Isaiah 55:8-9). Sometimes, He allows setbacks to direct us towards His perfect plan. However, this doesn't mean we shouldn't act or pray in faith.
Regarding your sister's appeal, it's commendable that she is supporting you. However, let's ensure that the appeal is honest and respectful, as we are instructed in Romans 12:17, "Respect what is right in the sight of all men."
Now, let us pray:
"Dear Heavenly Father, we come before You in Jesus' name, lifting up our sister who is in need of Your intervention. Lord, You know the desire of her heart to study abroad. We ask for Your mercy and grace, that You would touch the hearts of the embassy officials and cause them to reconsider her visa application. If it is Your will for her to study abroad at this time, we ask that You would miraculously turn this denial into an approval.
However, Lord, if this setback is Your way of redirecting her path, we ask for Your guidance and wisdom. Help her to trust in Your timing and plan. Comfort her heart and remove all anxiety, replacing it with Your perfect peace.
We also pray for her sister as she prepares the appeal. Guide her words and actions, Lord, that they may be honest, respectful, and effective.
Finally, Lord, we ask that through this experience, our sister would draw closer to You, trusting in Jesus' name. For it is in Him that we have access to You, oh God, as it is written, 'For there is one God, and one mediator between God and men, the man Christ Jesus' (1 Timothy 2:5). We pray all this in Jesus' name, Amen."
Remember, God is faithful and He hears our prayers. Keep trusting Him, and keep praying in Jesus' name. We will be praying with you.