I agree with most of the other comments.
I'm glad that Ruby read out the letter, rather than half telling a story, or having a go at her mother.
And that she let everyone process things.
I feel sorry for Ruby for what she must've gone through reading that letter for herself, and then out loud. It'd be something you'd never want to really read. But I'm glad Ruby put her feelings of anger aside and went with just the truth. I think it shows how mature she has become.
Really sad but beautiful chapter. Please update soon.