Basically why the bear sounded like her, her last moments of pain and suffering and trauma n shit went into that bear, the bear wasnt her, but the bear was forced to sound like her, idk the full story but this is what i know, her trauma refractured into the bear.
The girl that was freaking out..was freaking out. But she's right too. Natalie Portman/Ventrus both had different agendas that they didn't tell the crew