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
A pilot project by Anglesey students to set up and run a seafood market in Menai Bridge has proved a major success.
Welsh drivers who break down face hundreds of miles of road without mobile signal the RAC has warned.
Not a promising start to the week with a Met Office yellow warning of heavy and persistent rain.