Actress Ellen Pompeo has been accused of being an ice queen over her refusal to mend her relationship with former Grey’s Anatomy co-star Katherine Heigl. According a sensational report, Pompeo allegedly continues to reject any olive branch from Heigl, regardless of how hard the show’s outcast grovels to get in the her good graces, RadarOnline.com has learned. Pompeo and Heigl recently appeared chummy onstage at the Emmy Awards with Justin Chambers, James Pickens Jr., and Chandra Wilson, their former castmates from the ABC medical drama. Despite the mini reunion at the award show, sources claim…