I can remember reading/watching an interview with Alex Foden (not a fan of him, he seems to jump at any opportunity to get paid to talk about Amy) who said she got really upset during the grave scene and had to take a break to calm down (or something along those lines).
Aw... wish I didn't know that. She did look quite emotional when she was walking down the path... maybe related to her grandma's death?
@tselekoglu, well, it's like she's attending her own funeral... the nature of the video is dramatic which it's intended to be but I think mitch even said he was worried about it because she might die (as related to her drug problems).
I can't figure out why she thought she was going to die... her mind really did mess with her.