NDP health critic Danielle Chartier raised the case in Monday's question period as the latest example of why seniors' care needs to be improved.
The party says Louisa Moberly was in a La Ronge facility for two weeks before she broke her hip and had to be hospitalized.
"I would be shocked and appalled if that was the condition in which my parents, either one of them, ended up after being in an acute care facility," she said.
She added that she believes understaffing contributed to Moberly's injuries because she wasn't properly supervised.
"We've let Louisa down. The government has let Louisa down. We need to ensure going forward that she is in an appropriate care facility."
Health Minister Dustin Duncan said Moberly's case meets the requirements of a "critical incident" and is being investigated.
"They want to find out what exactly happened and what steps can be put in place to mitigate this from happening again," he said.
Opposition Leader Cam Broten has been calling for changes to long-term care for months and cited staff-to-resident ratios as a major problems.
He has said the Saskatchewan Party government continues to dismiss cases as isolated.
Duncan has said understaffing isn't a systemic issue at homes across the province.
Saskatchewan's ombudsman is nearing the end of an investigation into long-term care that was prompted by the death of a 74-year-old woman whose family alleges she was neglected.
Margaret Warholm lived at Santa Maria Senior Citizens Home in Regina until October 2013. Medical records show Warholm lost almost 14 kilograms in a year and had compression fractures in her spine. She also had a large bedsore on her back that her family believes could have been prevented.
Ombudsman Mary McFadyen said her investigation looked at whether standards of care were followed in Warholm's case.
Last week she said her office has received 79 complaints about various nursing homes and her recommendations on seniors care will apply to the entire province.