Irene is always getting 'insulted' by somebody.

But she is a lovely singer, I'll admit that, and people would just as soon hear her as Mrs.Channing." "It wouldn't do any good if you did ask her," said Olive significantly.
"Soon after we began planning this concert, back in April, I met Irene in town one day and asked her if she wouldn't help us out.

She said she'd love to but she really didn't see how she could when Rilla Blythe was running the programme, after the strange way Rilla had behaved to her.

So there it is and here we are, and a nice failure our concert will be." Rilla went home and shut herself up in her room, her soul in a turmoil.
She would not humiliate herself by apologizing to Irene Howard! Irene had been as much in the wrong as she had been; and she had told such mean, distorted versions of their quarrel everywhere, posing as a puzzled, injured martyr.

Rilla could never bring herself to tell her side of it.