The rift that opens between Emily and Evelyn suggests that Emily is quite unwilling to consider the possible dangers of her new husband. This reaction, it seems, is most likely why nobody else has broached the subject with her—she clearly believes Alfred is in love with her, so she vehemently rejects any suggestion that he’s trying to con her out of her money. Evelyn, however, will not be convinced otherwise, which is why she tells Hastings to look out for Emily, thus adding to the ominous atmosphere that has descended upon Styles Court.