Earlier in July, the 27-year-old star reportedly spent six days inside her home in London going through phone books and her Facebook trying to contact people she hadn't seen for a while.
A source told UK newspaper The Sun: 'Amy sent texts and messages to old friends and musicians to see how they were - a lot of them she hadn't spoken to in years.
'Looking back at it now, it was like she was preparing for something to happen to her. She was lonely, so maybe she just wanted to get in touch with familiar faces, but it's something she hadn't worried about before.'
She was found dead at her London home on July 23.