Pray that I make the correct discisions!

I have recently been given the responsibility of taking care of my 17 year old niece. I am scared to death that I will make a mistake with all the descisions that I must make. I need to know that others are praying for me. She was raised in a home much different than my home. The sitution is so different she seems to be happy here but i want her to come to know Jesus in a real relationship. Please pray that she will come to know Jesus in a personal relationship.