This young lady is Laura Tegg. The photograph was taken in 1970.
The waste ground at Edmondstown, Rhondda, where the picture was taken was the same when I visited it a few years ago, as it was in 1970 when the picture was taken.
The building on the right in the background is the Black Diamond pub.
Quite a number of kind people identified Laura Tegg from the BBC Homepage, which displayed some of the pictures for me.