I looked a little more, and now I'm less sure about the deed. When a couple sells land, the language "in her right" often signals that the land actually was possessed by the woman, often by inheritance.
Here is the deed in which Archelaus and Sarah Brown purchased that same land that they sold a few years later:
https://www.familysearch.org/ark:/61903/3:1:3QS7-L9ZH-LJWM?i=369&cc=2106411&cat=438974
The text is copied from that older deed into the newer deed, including "in her right." The copying is so bad that the second deed says "the sd. Wales" without first having referred to someone named Wales. That's because grantors in the older deed were Waleses.
However, I notice that the grantor was Oliver Wales, his brother Shubael Wales owned adjoining land, and that Shubael Wales had a twin sister Sarah. Shubael was born 6 October 1754 in Union, Tolland County, Connecticut, son of Ebenezer and Deborah (Ward) Wales. He has a Revolutionary War pension application while residing in Wales (previously called South Brimfield). He states his birthdate in Union, and that matches the one recorded for him and his twin sister Sarah.
So I would definitely look more at Sarah Wales, born 6 October 1754, to see if she would fit as the wife of Archelaus Brown.