MONTREAL Sarah Hunt-Donais worked two jobs to pay her way through a psychology degree, had a black belt in martial arts and was “like a mother” to her younger siblings, an old friend said. Hunt-Donais, 25, was one of the two Quebec youth protection workers who died by suicide this month in quick succession, sparking worry and grief among their colleagues, and public condolences from the province’s authorities. But Hunt-Donais’s death, while she did work at a famously stressful job, can’t necessarily be blamed so easily on work conditions, said an old friend of hers. The friend described her as a private person who wouldn’t want her problems summed up by strangers who never met her.