Lisa Willis has said she asked her sister Amanda for help on Facebook because she wanted to get out of the relationship with Mick Philpott.
She deleted the exchanges as she went along so they wouldn't be found, although she told Nottingham Crown Court that Mick Philpott couldn't use a computer.
Ms Willis said her relationship with Amanda had ended when she moved into Mick Philpott's home on Victory Road because he wasn't happy with it and her sister didn't like him.
She said she didn't see Amanda for years before resuming contact on Facebook.
The trial has now stopped for lunch.