Melanie Smith will be sentenced on 8 May for murdering five members of the same family in a flat fire in Prestatyn.
Mr Justice Griffith-Williams warned the 43-year-old that she should expect a life sentence.
More top news
Temperatures overnight not far off where they should be by day at this time of the year. It's very muggy out there!
The way children learn in schools across the country will change under a major-shake up.
The Welsh Rugby Union Board has approved a range of changes to the game in Wales.