Hi Jo,
Information for you goes as follows
Marriage of William Hoskins Barns to Lucy Powell reference is
Jul - Sep 1854 Honiton Volume 5b Page 23
1851 Census. (not available on Ancestry) HO 107/1861 Folio 507 page 11
Stone Borrow
Amey Powel Head Widow 69 Farmering 60 Acres 2 Labourers Colyton Devon
Sophia Daur U 34 Daur Dorset Charmouth
Lucy Do U 33 Do Do Do
Amey Do U 26 Do Do Do
Jane Elizabeth Do U 22 Do Do Do
William Grening Servant U 20 Farmers Indoor Servant Do Whitchurch
1841 Census HO107/282/11 Folio 1 Page 22
Stoneborrow
James Powell 50 Farmer y
Amy Do 40 y
Charles Do 20 y
Sophia Do 20 y
James Do 15 y
Sebilla Do 15 y
George Do 10 y
Amy Do 10 y
Joan Do 9 y
From the IGI/ Dorset Family History I found the following
Christenings
Thomas Powell 14/4/1811 James and Amey
Charles 21/12/1812 Do
George 13/3/1815 DO Butcher
Sophia 6/1/1817 Do Butcher
James 6/1/1817 Do Butcher
Lucy 10/10/1818 Do Butcher
Sebilla 7/4/1822 Do Butcher
Lucy 7/4/1822 Do Butcher
Amy Bull 16/5/1824 Do Butcher
Elizabeth Jane 9/4/1829 Do Butcher
Marriages
James Powell to Amy Bull 28/3/1810
Deaths/Burials
Sibella Powell 11/8/1841
Hope this helps , and I believe it shows that your Sebilla and Lucy were sisters
Best Wishes
Roy
P.s. sorry for the layout , but can't get TABS to be actioned correctly