She has been in the care of Ms Madill's parents, Darrell and Ruth Madill, since she was discharged from a French hospital four weeks after the June 5 crash near Montpellier.
The couple, who have three other adult children and three grandchildren, couldn't be contacted this week, but have spoken about Ayla's new life in Winnipeg, where she enjoys trips to watch her cousins play hockey and unwrapped a Peppa Pig doll for Christmas.
Collins' father, Frank, told the Herald on Sunday he wasn't sure of his granddaughter's birthday plans but he understood other members of her family had sent presents to Canada for the little girl.
His birthday wish for Ayla was for her to one day hear a special message he planned to share with her when she visits New Zealand. Mr Collins and other members of his immediate family travelled to Canada last year to spend time with Ayla, and her Canadian family had indicated they would bring her to New Zealand "when she's ready", he said.
"That will be great for us. I've got something good to say to her. I will read some words from the Bible to her, because I'm a Christian. I will open the Bible and find something to share with her. It will be a great honour."
Doctors have previously warned Ayla was likely to have ongoing disabilities as a result of her head trauma, although the full extent would not be known until she was older. Mr Madill has previously said his youngest grandchild was improving every day.
His daughters kept in touch with the Madill family and he understood Ayla was still doing well, Mr Collins said.
Ayla holidayed with her family in the Californian desert town of Palm Springs last month and photos show the chubby-cheeked baby also enjoying cuddles with friends of her dad, including Stevenson Malotu'upule, who, with former All Blacks Tana Umaga and Chris Masoe, escorted Collins' body home to New Zealand.
In another, she poses with her grandparents and cousin at a look-out over the Coachella Valley, site of the famous music festival.
As Ayla's Canadian family prepared to celebrate her birthday this week, the baby's paternal kin gathered on Friday to celebrate the naming of the Porirua Park Stadium in her father's honour.
The park is now the Jerry Collins Stadium. Collins was raised in Porirua and played for the Northern United Rugby Club, whose members performed a haka during the emotional naming ceremony.
His father gave thanks to those who helped the family "in hard times" since his son's death, and for the honour given. "We are lucky it's got Jerry's name."
