Hello
Hope the following may be of some help.
In 1871 Elizabeth`s place of birth is Merthyr Tydfil
In 1851 there seems to be only one suitable Elizabeth and family in Glamorgan as follows.
The family address is about 5 houses from Penydarren lodge,
The neighbouring enumeration district is Penydarren.
1851 Glamorgan
Merthyr Tydfil Upper
Cyfartha
2459 504 011
BRECON ROAD
CAMPBELL JAMES HD M 45 FURNACE FILLER IRL -
CAMPBELL MARGARET WI M 47 - GLA MERTHYR TYDFIL
CAMPBELL JANE DA U 19 MINE BURNER GLA MERTHYR TYDFIL
CAMPBELL MARY DA U 17 MINEBURNER GLA MERTHYR TYDFIL
CAMPBELL ELIZABETH DA - 14 FILLER GLA MERTHYR TYDFIL
CAMPBELL DAVID SO - 12 MINE DOORBOY GLA MERTHYR TYDFIL
CAMPBELL JAMES SO - 9 - GLA MERTHYR TYDFIL
CAMPBELL JOHN SO - 5 - GLA MERTHYR TYDFIL
PROSSER MARY VR W 54 PARISH SUPPORT GLA MERTHYR TYDFIL
In 1861 there is an Elizabeth Campbell aged 24 unmarried ,in service in Bedwelty parish Monmouthshire.RG9 4001 F 73 P 12.
She is at 3 Watchmakers Row Rumney About 4 miles from Penydarren
Her place of birth is given as Glamorgan ,Pendarren(i think).
If she gave birth to Alexander in the vicinity then the Registration district from
July 1861 for Bmd purposes would have been Bedwelty Monmouthshire.
Rhys