Dear all, I need suggestions.

My sister had applied for F1 and her visa got rejected because I have a green card and the counselor told her she is Potential Immigrant. She otherwise has excellent grades, no problem financially and worst is she is the only one amongst her fren who dint get visa, i feel I m responsible for this. Now my question is should she reapply again or wud it be a waste and in the form if she doesnt mention about me being here, will she be caught. Has any body been in similar situation, I just learnt many people dont mention bout their sibling's status. I wud appreciate ur comment.