Melanie Smith, who has been found guilty of five counts of murder, appeared to collapse into the security guard as the first verdict was returned.
As the remaining guilty verdicts were announced by the jury foreman, 43-year-old Smith bowed her head and looked to the floor.
In addition to five counts of murder, Smith was also convicted of one count of making threats of arson.
Relatives of the Prestatyn flat fire victims were heard crying in the public gallery as others shouted, "Yes".
Trial judge Mr Justice Griffith Williams told the court he wanted "time to reflect" before passing sentence.
The father of two children, murdered by a woman in a drunken rage, spoke today of his grief that he would never see them grow up.
A "drunk and jealous" woman has been found guilty of murdering five members of the same family after she started a blaze at their home.