Have you searched Welsh Journals under the search key "Lowry Foulk" - returns 1 hit. Interestingly, she is returned with an "Edward Foulke" and the date is 1662. Did wonder if this Edward is Lowry's husband?

The item relates to a "Hearth Count/Return". If you check the previous page the return relates to "Caervallough" (Caer-Vallwch" a hamlet in the Parish of Northop, in the hundred of Coleshill - a long way from the Bala area). The previous page states "Continued from page 104" - which can be found in the previous number - Vol XVi No. LXII April. Had a quick look but need to check further.

In addition have been checking out wills for "Edward Foulk", (possibly Lowry's husband?) -
Welsh Wills - https://library.wales/searchwills/

These are NOT easy to read.

pob lwc/good luck