"You are in my prayers." - Just by praying a simple Hail Mary for someone can bring s much comfort and hope.
Hail Mary full of Grace, the Lord is with thee. Blessed are thou among women and blessed is the fruit of thy womb Jesus. Holy Mary Mother of God, pray for us sinners now and at the hour of our death Amen.
For more urgent prayer needs consider praying Blessed Mother Teresa's express novena that is never known to fail, the Memorare prayed nine times consecutively.
Remember, O most gracious Virgin Mary, that never was it known that anyone who fled to thy protection, implored thy help, or sought thine intercession was left unaided.
Inspired by this confidence, I fly unto thee, O Virgin of virgins, my mother; to thee do I come, before thee I stand, sinful and sorrowful. O Mother of the Word Incarnate, despise not my petitions, but in thy mercy hear and answer me.