At one point, as Laidlaw said he would move on to the topic of Brooks' marriage to actor Ross Kemp and their attempt to have a child, she asked if she could have a break and left the court.
She also revealed that a cousin had acted as a surrogate to help her and her second husband Charlie have a baby, called Scarlett. Charlie Brooks, a friend of the prime minister whom she married in 2009, is also on trial for trying to hide evidence.
The relationship between Brooks and Coulson was discovered after police found a document containing a 2004 letter on a computer at Brooks' London home. She had written the letter after Coulson tried to break off the relationship.
"I do not know if anyone has been in the situation at a time of hurt - you come home and have a couple of glasses of wine and shouldn't go on the computer," she said, adding that she had woken up the next day and thought better of sending the letter.
(Read more: Ex-News Corp execs hauled to trial in hacking case)
Brooks was responding to questions as Laidlaw guided her through her career. The former editor, who was a close associate of both Murdoch and Prime Minister Cameron, also told the court on Friday she had not been aware of the tens of thousands of pounds that was paid to private investigator Glenn Mulcaire who has admitted phone-hacking.
Brooks had told the jury of nine women and three men a day earlier that she had not even heard of Mulcaire and that it was impossible for an editor to know every source for every story.
Brooks and Coulson are accused of conspiring to hack into the voicemails of high-profile public figures or those close to them and also of making illegal payments to public officials. They deny the charges.
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