Amazhon, QuestBridge is selective to an extent, but not extremely. If your niece is a low-income student (generally under $60k income by QB's standards), and does decently in school (good GPA, some extracurriculars, etc.), she should make it to finalist status in the National College Match. It's harder to get one of the College Prep Scholarships, but if she has good recs, etc. she should have a decent shot.