It's just that they rarely meet.
Nowadays, when Jiang Mei meets Nan Jingkang and Nan Madam again, she still appears humble and polite as before, leaving Nan Madam puzzled about why.
Logically, she could have evicted them by now, but not only hasn't she done that, she's treating them even better than before.
She buys things to give them, gets Nan Madam clothes and cosmetics, searches for old trinkets for Nan Jingkang, she's quite clear on their tastes.
Nan Madam occasionally goes out with Nan Jingkang, but mostly stays at home reading. Even when Jiang Mei comes to deliver gifts, she accepts them coolly without much conversation.
She always feels she can't understand this girl; she doesn't like women who hide their true selves. Apparently, Achen's dislike of her is justified.
She recalls asking Nan Jingkang, "What do you think Jiang Mei is planning now? What does she intend to do with the two of us old folks?"
