But Stevens said Nicky's safety as a patient of the Henry Rongomau Bennett Centre should have been given priority over his need to be outside and smoke.
"For me the most important thing was Nicky's safety. There had to be a balance of all these things but safety was paramount."
She felt daily escorted leave with family should have taken care of Nicky's desire to be outside.
During questioning from Harry Waalkens, QC, acting for the psychiatrist, Stevens denied Nicky - who suffered from paranoid schizophrenia - did not want his parents involved in his care.
Nicky was delusional and believed aliens were trying to kill his family and friends. He also believed the clinicians were aliens, his mother said.
She had to betray her son's trust and tell doctors about his behaviour and suicidal thoughts, which she admitted was challenging.
However when Waalkens suggested Nicky told staff he did not want Stevens, and his father Dave Macpherson, included in his care, she said records did not reflect that.
"I do not accept that."
During questioning from coroner Wallace Bain, Stevens said she was informed on March 3 by the Waikato District Health Board psychiatrist who took over her son's care the day before, that Nicky's unescorted leave had been reinstated to two 15-minute breaks a day.
Only the day before, Nicky's unescorted leave had been put on hold and the family understood they would be involved in any decisions to change that.
The psychiatrist's evidence was contradictory to Stevens', stating that no major concerns were raised by the family over Nicky having unescorted leave.
Where to get help
If you are worried about your or someone else's mental health, the best place to get help is your GP or local mental health provider. However, if you or someone else is in danger or endangering others, call police immediately on 111.
OR IF YOU NEED TO TALK TO SOMEONE ELSE:
• LIFELINE: 0800 543 354 (available 24/7)
• SUICIDE CRISIS HELPLINE: 0508 828 865 (0508 TAUTOKO) (available 24/7)
• YOUTHLINE: 0800 376 633
• NEED TO TALK? Free call or text 1737 (available 24/7)
• KIDSLINE: 0800 543 754 (available 24/7)
• WHATSUP: 0800 942 8787 (1pm to 11pm)
• DEPRESSION HELPLINE: 0800 111 757