Hi Nicky,
I think I have found your family in 1851 but no Mary with them.
Thomas Packer 45 Head ag lab b. Woolfardisworthy, Dev
Jane Packer 45 Wife b. Broodwoodkelly, Dev
Catherine Packer 13 dau b. East worlington, Dev
Richard Packer 8 son b. Cheldon, Dev
Living Week Cott..., Chulmleigh, South Moulton, Devon.
Have you idea of where Mary was born. It would help with finding her. She could be a servant somewhere and her name transcribed wrongly so it would help tremendously. She isn't living in Chulmleigh by the looks of things. Is she the eldest child??? Is she definately a Parker and not got her mothers surname???
Hope what I found is some help to you anyway.
Good luck in finding her.
Angela.