Friend of My Youth vs. The Love of a Good Woman - quick observation

It's odd if you compare the nurse Audrey Atkinson in "Friend of My Youth" to Enid in "The Love of a Good Woman". Both are nurses who come into people's homes, both take care of young ladies who are dying and difficult to deal with. 

But Enid is described as someone who truly cares, too - not a saint like some people call her, but a genuinely empathetic person. Audrey, on the other hand, is selfish and greedy, an opportunist who steals her patient's husband and has no empathy for anyone. 

Or is it just the way the narrator's mother sees Audrey? After all, we get inside Enid's head, but we only have  the narrator's mother's account in Audrey's case. 

Coming to think of it, it's a little strange that "Friend of My Youth" is narrated by someone who wasn't even there, and is only discussing what the events looked like to her mother. It's like a third-hand narrator. Nobody can tell what really happened between Flora and Robert, or Ellie and Robert, or Audrey and Robert; we only know how Flora carried herself to the outside world, and how brash Audrey and Robert seemed. 

Is there any point in hating Audrey when it's obviously Robert who betrays Flora twice - first by sleeping with her sister, then with the nurse? All he had to say was no. Unless he's a bit simple and they were abusing him. It's so hard to tell.