Though, most of the good things she’s done are highly questionable, some even actually bad. Like the execution of the priest. She didn’t do it because she heard that he was evil or something, but she stated (page 16 in last chapter) that she did execute priests that admonished her for her...
It’s the right arm put behind his back, so she can wash it standing on his left side. Why she switched sides I don’t know as we can see that she stood on his right side a few pages ago and the page after.
Makes sense that some women have affairs considering Egir is so rarely at home that he doesn’t recognize all of his kids and some kids don’t recognize him as seen in this chapter.
Why would the author make that up? That being said the theory of a Portuguese origin is mentioned on the website of the Japanese Ministry of Agriculture.