Noticed this from the Beds Archives Online Catalogue
Ref X547/86 re... Articles of Covenant dated 1671
Regarding the sale of cottage, stables, orchard in Souldrop in which Robert Brooks dwells...
by Margy Mewes of Olney, Bucks. widow; for £18
to William Evans of Souldrop, husbandman
while Edward Mewes, eldest son (of Margy Mewes) will seal the deal, will clear off Robert Brooks & give William Evans peaceable posession on Lady Day
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Now I've not found any Mewes surnames in Olney, as per the parish registers supplied by Bucks FHS
Nor have we got a baptism of this eldest son Edward
So I'm not sure if this is your Margery Mewes but it could well be !
Cheers John