Melanie Jane Smith is due to appear before magistrates in Prestatyn on Tuesday morning in connection with a house fire in Prestatyn.
The 42-year-old was charged with four counts of murder, one count of arson with intent to endanger life and threats to commit criminal damage yesterday.
Lee-Anna Shiers died in the fire along with her niece and nephew Bailey and Skye Allen. 15-month-old Charlie Timbrell died from burns suffered in the fire at Liverpool's Alder Hay Hospital.
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New laws come into force today to help police tackle the sale and production psychoactive substances.
A warmer day than yesterday with more in the way of sunshine! But there'll be showers around too!
Showers will persist in the north but it should remain dry elsewhere with cloudy skies.