ELISABETH BATT
Writer of Christian-themed children's books. As far as I know just the two pony stories.

Pony Books:

A PONY TO STAY
(LUTTERWORTH 1968)
Reprinted in paperback by Lutterworth in 1976.

THE WILDE RIDERS
(KINGFISHER 1960)
Reprinted in hardback by Lutterworth
SUMMARY: Vicky is rich. Alison is the powerful leader of her 'set' at school. The Sherwoods have a secret society and do good deeds in the village. These people have everything - or do they? They need more than these things to cope with the problems of a broken home or a school corridor, and to ride through the storm as Katherine Wilde once rode to her death.

Collectors info:
Although not common, both books can be found on the internet without too much trouble and are usually low cost.