Hello Dahl,
OK, I'll play.
Your mother is obviously a manipulative person. She's writing out of the blue about something that she cares about and a relationship she had to "demonstrate" her ability to have a wonderful relationship with the idealized (and conveniently dead) father. This is a hint to you that you should feel the same way about her and start showing it before she croaks. Isn't she a wonderful daughter? Don't you want to be one too?
And Ns are so great at sending these cryptograms to inspire you to spend tons of time trying to figure out where they are going with all this (being a rational person). All they need to do is create a bug in your computer program to make you crazy and keep you focussed on them. Like a Trojan Horse virus. Rather than be direct, gee, I'd like to see you and talk about things, you get this Jumble puzzle to figure out. It's also to inspire you to feel inadequate or jealous about the fact that you don't have this same glowing relationship that she supposedly had with her dad.
I can understand why you would be estranged if she is constantly stirring the stomach acid. Chalk it up to a helpful reminder of why you two cannot communicate in a healthy manner.
Take care, MP