You do realize this is a transcript of a spontaneous conversation? It's not a model of perfect English.
The person is talking about what places a person "over the edge," meaning here that they have been selected. What gives candidate A the preference, the "edge" over candidate B?
The person talking seems to be mixing up several expressions, but the point that she agrees with affirmative action is made.
Her answer is largely unformed thoughts and not really sentences.
This is an academic attempt to justify selecting students based on race. Even when the person of the "preferred" race is equal in all aspects to a person of the "non-preferred" race in both test scores, grades and background/opportunities.
"I guess that would be, you know, justifiable" she says, without offering any justification.
I wouldn't dig too deep into this stream-of-consciousness.
Student or Learner