Looking for Ann Alloway

Ann had a son William ALLOWAY in Torpoint, Antony, Cornwall in 1815-1816. She returned to Trowbridge, Wiltshire by 1817. In 1826 the Poor Law Removal Orders show that she was returned to her home parish of Hilperton and her son William returned to his home parish of Torpoint, Cornwall. I am looking for Ann’s information- birth, death, or marriage. Parish registers for Hilperton do not show her- am I missing something? She is also not in Cornwall. No age is given for Ann on the Removal Orders. There is an Ann ALLAWAY/ALLOWAY chr at North Bradley Wilts 27 Sep 1795 to John and Ann, but would she be returned to Hillperton if she was from North Bradley?