Mairead Philpott is telling the court that she tried to take her own life after her husband's girlfriend, Lisa Willis, left the family home.
"I thought if I was gone then everybody else would be happy," she said.
She also confirmed that she wrote the suicide notes and that they reflected what she was thinking at the time, but denied that she would contemplate killing her children at the same time as herself.
More top news
An orangutan who has lived in a zoo for the past 20 years, can be granted basic human rights, a court in Argentina has ruled.
Socialite Tara Palmer-Tomkinson has been cautioned by police after a 'disturbance' at Heathrow Airport.
The NHS is to set up 11 centres to unlock the secrets of DNA and help develop tests and drugs to target cancer and rare genetic diseases.