Or, the police officer told her to keep her hands where he could see them. You can hear him say that on her video.
If she leaned over to her boyfriend, the officer would think think she might be going for the firearm.
And her little girl, who was there, would likely watch her mother die.
That did not seem to be her concern. Her concern was with documenting the event and broadcasting it. She gave no indication that she had any desire to try and save her boyfriend's life. Maybe she didn't realize that he was in such grave condition. It just seems strange to me that's all.