The most important thing you can do is urge her to seek God's will for her future. God has a perfect plan for each of us, and life's greatest joy comes from knowing Christ and following His purpose for our lives.
After all, God knows all about your daughter. He created her; He gave her a unique set of abilities; He knows what is best for her. We can stumble through life without seeking His will, or we can turn to Him and follow His path–but His way is always best, without exception. The Bible says, "As for God, his way is perfect; the word of the Lord is flawless" (Psalm 18:30).
And God wants us to know His will! The reason is because He loves us, and He wants what is best for us. Pray for your daughter, and urge her also to pray about her future. If she's never committed her life to Christ, that should be her first step in seeking God's will. Then encourage her to trust God to lead her–to open the right doors (and close those that aren't right)–and to give her peace about the next step in her life.
The Bible says, "Trust in the Lord with all your heart and lean not on your own understanding; in all your ways acknowledge him, and he will make your paths straight" (Proverbs 3:5-6). May these words take away her fears and help her trust her life and her future into God's hands.