She explained: “Because there was one line, where Penelope says to Eloise, ‘You cannot lie to me!’ And I went, ‘Why is she saying that?’ And I sort of questioned it and [the writers] said ‘No, please say it. It’s important because of later on.’ And we both went, ‘Oh, no. Oh, no. This is bad.’”
Article source: https://www.huffingtonpost.co.uk/entry/bridgerton-nicola-coughlan-eloise-scene-season-2_uk_624dbeb2e4b0e44de9ca1eb7