Bobbi Kristina -- I'm Doing Oprah Because I TRUST Her

Bobbi Kristina -- I'm Doing Oprah Because I TRUST Her: Bobbi Kristina isn't doing her first post-Whitney interview with Oprah Winfrey because of the money -- she's doing it because the big O's a close family friend ... and Bobbi trusts her to be fair and respectful.Bobbi is telling friends -- Oprah "was…