Why do you think she should have done it?
She wanted to be helpful.
She was not as upset as everyone else. As was not related to any of the deceased.
She still didn't believe or was not sure Bamber was guilty. Bamber said he had not committed the massacre 'he couldn't have'. And that 'Mathew had done it'.
She was asked to.
She was not doing anything useful or constructive, as had been whisked over by Bamber. So offered, or was asked.
Bamber seemed to be coping well, and could cope for a short period while Julie went to identify the bodies.
She went with another relative to give moral support.
If she didn't go with another relative, then she would have originally assumed she would be accompanied.
She believed Bamber was guilty, identifying the twins is no worse than being by his side as he acted.
She knew the twins and could identify them apart.
Bamber didn't offer to do this.
CC refused to identify the bodies.
Her WS was true and she felt she could communicate with them.
She offered in error. But couldn't withdraw once the offer had been made.
She wanted a break from the crime scene and police. Which was a situation she had not asked to be a part of.
She believed seeing the twins would help her come to terms with what had happened.
She was in the room when discussions about who would do this started. So not surprising she ended up doing this.
If not in the room, Bamber or someone else recommended to the police Julie could do this.
The police felt Julie was the best person. She could identify the twins but had least emotional attachment.
She had little attachment to the twins. They were her boyfriends sisters, sons.
Bamber had brought her over in a police car. She assumed this was so she could be helpful. Identifying the bodies is being helpful.
No one tried to stop her identifying the twins.
Another person offerred but the police turned her down.
A combination of several of the above.