Hello
The 1851 census gives Joseph and Mary as 55 and 55/53 born Clun and Bugildge Montgomery.
The 1841 45 and 43 not from Shropshire
So going on that I'd go for
Mary Jones 30.11.1800 Bettws y Crwyn to William and Martha Jones
I went for her as her sister Ann is baptised at Bugeildy 2? Jan 1802
Other siblings Charlotte 19.4 1795 ,Edward 3.3.1799 at BY Crwyn
Clun possibles-Richard 5.4.1789 ,Mary 16.9.1792 , James 25.12.1793,Elizabeth 19.6.1796 ,William 24.4.1805 ,John 22.3.1807
Sorry it's all a bit vague but with a name like Jones there are a lot to choose from.
Ciderdrinker