Hi Ash, it could well be that Jane had left home by the time of the 1841 Census, this possibly could be her parents and siblings in 1841:-
1841 Census
Hugh Hughes 45 occ Copper Miner Not Born in County
Mary 40 Not Born in County
William 15
Elizabeth 12
Owen 10
John 8
Eliza 6
Robert 4
Ann 1
Residing at Morfa, Llandudno, Caernarvonshire.
Census Ref HO107/1389/ 3/13/ 20
As I say only a possible, but see what you think, and and by the way, welcome to Rootschat!
Keyboard86