Do you have a copy of Elizabeth Gilpin's death certificate? What was the cause of death? I see she was aged 34 at her death so she was less likely to be a pauper inmate, but may have been admitted to the workhouse hospital rather than being a pauper inmate of the workhouse itself. Often workhouse hospitals were the only medical care available to those who, whilst not destitute, were too poor to afford to pay for medical care. That may explain why she was subsequently buried in her 'home' parish,
Peter Higginbotham's Workhouses website may be of interest particularly this page on medical care.
http://www.workhouses.org.uk/life/medical.shtml