Hi Adele
I have done another search of the 1891 using Eliza Davies as the search name and lo and behold the Matthew Davies family are still in Ebbw Vale at the same address.
The bad news is there is still no sign of Beatrice Davies living with this family. The 1891 census gives:
Rg12/4358 44 12 25 Victoria Road, Ebbw Vale
Matthew Davies H 42 Hitcher at Colliery b. Monmouthshire
Eliza Davies W 42 b. Bedwelty
David Davies S 14 b. "
Marg Edith Davies D 11 b. "
Isaac Davies S 5 b. "
Thomas J. Jones Neph 18 Haulier b. "
I have done a search for Beatrice Davies in the census for Bedwelty and the only one I have come across of the right age (approx 10) is the daughter of a John and Elizabeth Davies living in the Tredegar area, which is only a few miles from Ebbw Vale. Both parents and Beatrice were born in Tredegar and John's occupation is Foreman at Iron Works.
So unfortunately the Matthew and Beatrice details do not match. I was pretty sure the birth index for Beatrice was the one you were searching for, I do hope I haven't sent you down the wrong path.
I will do a wider search in the census to see if I can come up with anything else and I will take a look for Matthew Davies in the birth indexes circa 1848. Meanwhile, if you require the details of the Davies family in Tredegar, let me know and I will post them.
best wishes
Steve