Thanks ,I will talk to her, I am also looking for a counselor to talk to her.
Is she willing to talk to you about what she has seen? If so, discuss it with her. Let her know which stuff is not appropriate, which is appropriate between a husband and wife, etc. You should also explain why certain behavior is wrong or is only acceptable between a husband and wife, and so forth. Also, get parental controls on the computer to block certain sites. If her behavior continues, I would consider the counselor idea (I would have her talk to her pastor and pastor's wife if she was my child.) but start by seeing what she will discuss with you and go from there.