I have Thame PRs on CD from Oxon FHS but the baptisms only go up to 1930 - so no Doris.
However, there is this baptism from 1928 which looks like Doris's older brother:
Baptised 14 Oct 1928 Francis Edward born Aug 18, s/o Frederick James and Winifred Louisa, plasterer, 50 High Street, Headington, Oxford. Godp: Parents, Daisy Eliza Tipple.
Not sure why they would have him baptised in Thame when they lived in Headington? Perhaps that's where Doris was baptised?

Jill