A long gap between children

[vallee]

Edward COCKSON born 1832 Shoreditch and
Caroline DEWAR born 1828 Stepney
marry in 1855 in Stepney

1861
Children
Edward John born 1856 Stepney
Mary caroline born 1857 Mile End
Annie Louisa born 1858 Mile End
1871
Mother Caroline is with these 3 children plus
Georgina Caroline born 1869 in Hornsey
Cannot find Carolines Husband Edward

Seems a big gap between Annie and Georgina ??
any ideas please ? thanks

both parents had died by 1881 and I cannot find Georgina in 1881