Well, that would be a problem for me. In 1841, I have a Helen Scott living with an Isabella Dodds (both aged 70) at Smiddyhaugh, Auchterarder, Perthshire. Both not born in Perthshire. My belief has been that these two women were the daughters of William Dods and Agnes White.
Helen Dods married William Scott and around 1800 they were living on the Kirklands estate near Ancrum where William was the steward. My belief was that the family moved to Newton Gorthy, Fowlis Wester, Perthshire, some time before 1813. The Fowlis Wester records have an 1813 baptism for Thomas the son of William Scott and Helen Dod.
However, I have no problem with being proved wrong on this point, so I am most interested in the Helen and Margaret who were living at Crailing. Could you let me have the details. I know the 1841 census is a bit sparse.