She and a group of people she'd reached out to bought 215 pairs of children's shoes - one for each of the children whose remains were found buried beneath the former school in Kamloops.
A mass grave containing the remains of 215 children has been found in Canada at a former residential school set up to assimilate indigenous people.
"We are profoundly saddened by this discovery and our thoughts are with Tk'emlups te Secwepemc First Nation, as well as with all Indigenous communities across Canada", said Minister of Crown-Indigenous Relations Carolyn Bennett and Minister of Indigenous Services Marc Miller.
Di Tk'emlups te Secwepemc First Nation say dem find di deadi bodi wit di help of one ogbonge radar equipment when dem dey do survey of di school.
"It's a secret, or it's something we knew that may have happened there, but we had no evidence".
Trudeau wrote in a tweet that the news 'breaks my heart - it is a painful reminder of that dark and shameful chapter of our country's history'.
The main administrative building of the Kamloops Indian Residential School is pictured in 1970.
"To our knowledge, these missing children are undocumented deaths", Ms Casimir said.
The Kamloops school operated between 1890 and 1969, when the federal government took over operations from the Catholic Church and operated it as a day school until it closed in 1978.
The leadership of the Tk'emlups community "acknowledges their responsibility to caretake for these lost children", Casimir said.
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Di tribe say dem don contact di home communities wey na dia pikin attend di school. They expect to have preliminary findings by mid-June.
The indigenous children, some as young as three, were students at the school, which was once the largest in Canada's residential school system.
Di reaction of pipo na of shock, grief and e turn many pipo belle.
Meanwhile, plans are already being made to identify and possibly repatriate the children's remains to their respective communities, according to Assembly of First Nations regional chief Terry Teegee.
They are working with the community and partners such as the BC First Nations Health Authority, to provide resources and the support needed as determined by the community, the ministers said.
From about 1863 to 1998, more than 150,000 indigenous children were taken from their families and placed in these schools.
Dem no go allow di children to speak dia own language or practise dia culture, and dem maltreat and abuse many of dem.
The authority's CEO, Richard Jock, said the discovery "illustrates the damaging and lasting impacts that the residential school system continues to have on First Nations people, their families and communities, ". The Missing Children Project documents the deaths and the burial places of children who died while attending the schools. That process is still ongoing with many community members still grappling with the effects of the residential school system.
A report more than five years ago by a Truth and Reconciliation Commission said at least 3,200 children had died amid abuse and neglect, and it said it had reports of at least 51 deaths at the Kamloops school alone between 1915 and 1963.
The commission noted in its 2015 report that officials in 1918 believed children at the school were not being adequately fed, leading to malnutrition.