Just having a look at the GRO
This one is the correct spelling
KILSHAW, ELLEN MMN TILLY
GRO Reference: 1851 D Quarter in PRESCOT Volume 20 Page 862
This covers the reg district
KERSHAW, ELLEN JONES
GRO Reference: 1853 S Quarter in WARRINGTON Volume 08C Page 126
Do you know who the marriage witnesses were and her father's occupation from the marriage cert.?