Dissapointment

I've had so much on my mind lately. I've spent the last several days in a bit of grief and dissapointment. I am kinda friends with a fellow student at my school. She is super sweet and we have talked several times but never about anything in depth. She never seemed interested in Christianity or God. I didn't even think she was hungry for the Lord. So i lived my life the best i could and was friendly with her thinking she would come to me if she was interested in what i have [joy]. i definately didn't explain the Gospel of Jesus Christ to her bc i didn't want to make her uncomfortable. About a month ago i started to see her posting some things online that were a little different and i started to wonder if she recieved Christ's salvation. When i asked her about her "newness" that she posted online she told me she had gotten a lot closer to God lately. I was stoked to hear that! not long after that i saw that she posted new baptism pictures! so i jumped up and danced around all excited..believing that she recieved salvation and was baptised into a church. when i looked at the pictures online i was left shocked and completely dissappointed. She was baptised into the Mormon-Church of Latter Day Saints. You see she was hungry all along. I didn't think she wanted to hear about the truth and newness of life...but uh...i was so wrong. she was so desperate to be renewed that she joined a church, any church. I had an oppurtunity to share the truth with her but the devil walked through that door instead of me. i was so wrapped up in my world that i didn't recognize the hungry cries of a lost soul.
Where is the body of Christ? Am i the only Christian she knew? I know i'm not. Why didn't a Christian tell her about Jesus? Why are we ashamed? While Christians are sitting back quitely...living our lives in righteousness....we are not telling the world about the Savior. This leaves the world searching for truth so desperately that they will believe anything. i am so dissapointed.