Personally I think that dwelling on the past is unhealthy for a person and the kids they parent.. You have to move on at some point. I get it, but she’s to old now to wallow. I would say feel it, just don’t put it on the blast if you don’t want people to ask questions She needs to hold back on some things.Family relationships can be so complex and I always saw the way she wrote about her relationship with her mother as a kind of therapy for her. As someone who has complicated relationships with my own family, putting it all out there in the public domain is not something I would choose to do. However, I never saw the way she wrote about her mother as her shaming her, or having a dig, but I think she has been deeply damaged by her mum leaving the family when she was so young and then growing up in an environment where she didn't feel loved or nurtured. Whether you believe her account of her childhood after her mum left or not, I think its plain to see that it was a cataclysmic event which has shaped who she is today, and is not something she has fully recovered from as her relationship with her mother is still clearly not stable and a lot of R's behaviour suggests a need for approval/to be loved/to be the hero etc.
I do think it is lovely that T has such a good relationship with her though, and R clearly encourages that, regardless of whether they are speaking or not, because she knows how much it means to her.
I agree it probably shouldn't be used for content, for T's sake more than anything.