Probably Jane Paulet (c. 1656 - 1716) who married John Egerton, 3rd Earl of Bridgewater. It could also be her daughter in law Elizabeth Churchill.
The graph displays the other subjects mentioned on the same pages as the subject "Lady Bridgewater". If the same subject occurs on a page with "Lady Bridgewater" more than once, it appears closer to "Lady Bridgewater" on the graph, and is colored in a darker shade. The closer a subject is to the center, the more "related" the subjects are.