Daily entries from the 17th century London diary
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Failed to identify, but I think the sense of the entry is obscured. By ‘her brother’s lady’, I feel he meant that the lady was regarded by Elizabeth’s brother in a broadly chivalrous way, ie. the lady might have been loosely called ‘his lady’ if he were the one to introduce her or ‘carry’ her to the company. Best I can do.
L&M identify her with the following footnote: “I.e., Lady Kingston’s brother’s lady; Elizabeth, wife of Maurice Fenton.”