Have you tried Find My Past, the English version of Ancestry Com. I found this baptism record:
Jennings, John Jones 1859 Flintshire Baptisms Gorsedd, Flintshire, Wales
Unfortunately, like Ancestry this is a paid website and I can't access the actual record or image. I have allowed my membership to lapse as I pretty much figured out my Welsh heritage. But when I used it, I found a wealth of data.,
There are 565 results for Mary Jones 1832 Holywell, Flintshire, Wales. Yep, a pretty common name. .
I was lucky in that my family names were easy in Wales...Williams, Richards, Davies....LOL
Beat of luck.