She instructed expert medical negligence lawyers Irwin Mitchell to investigate whether her cancer could have been diagnosed sooner.
It comes after Sheffield Teaching Hospitals NHS Foundation Trust, which was responsible for analysing her 2019 smear result, admitted a breach of duty.
Had her smear been accurately reported then her case would have been reviewed and she might have then undergone treatment to remove the cells by the end of 2019.
Her lawyer, Rosie Charlton, said they were pleased to have secured Mrs Dunkley the answers she needed.
“Worrying issues in the care she received have been admitted,” she said.
“We’re now working with the trust to secure a settlement so Shannon can access the specialist therapies and support she requires because of her cancer.”
Ms Charlton said despite the issues in the case it was important women continued to take part in the screening programme and that early detection and treatment were “the key to beating cervical cancer”.
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