HI Dee,
Birth
1880 C1715 Honorah Callaghan mother Honorah Sullivan Callaghan
From the birth it appears the mothers surname is CALLAGHAN and her first two names are Honorah Sullivan. There is no father named so the child appears to be illegitimate.
Death
1880 C531 Honorah Sullivan - Honorah Callaghan ** now Sullivan - born Toowoomba aged 10 weeks
So it appears Honorah either married or begin living with a SULLIVAN as if married, between the birth and death, but Honora was a CALLAGHAN.
Kellie