She has appeared at Sheffield Crown Court today with co-accused Brandon Machin, 39, after pleading guilty to the killing of Tristan and Blake Barrass, aged 13 and 14 respectively.
The pair have also admitted conspiracy to murder six of the female defendant's children, including Tristan and Blake, and five counts of attempted murder.
This is the shocking timeline of the murders.
1. Shiregreen murders
Emergency services were called to a home on Gregg House Road, in Shiregreen, this morning at around 7.30am Photo: Dean Atkins
2. Shiregreen murders
An air ambulance landed in the grounds of nearby Hartley Brook Primary Academy Photo: Dean Atkins
3. Shiregreen murders
Six children were taken to hospital, where two boys, aged 13 and 14, later died. Photo: Steve Ellis
4. Shiregreen murders
The four younger children remained in hospital, where police said they they were conscious. Photo: Steve Ellis