Hi elsbeth. What you describe in your post all sounds perfectly ordinary on so many levels where there is a (now) healthy relationship - exchanging cards and letters (especially as you say the past is in the past).
You sound so aware and on top of things that I don't know how much advice you need e.g. I'm sure you'll make her welcome and treat her visit as being special. I suppose it is a bit strange when you gain a MIL not having had one, but the relationship has slowly been established over the past 2 years with photos and contact from you. With a visit it will now develop further, as they do!
I suppose I'm trying to say "just act normal". I don't get any terrifically special treatment from my DIL when we visit and I like it that way. What I do appreciate is when she buys me a gift (say at my birthday) and writes a personal message just from her.
Angela Rayner lashes out and calls Sunak “pint sized loser”.
Can I use my bus pass on London buses?
Parents-in-Law. What do/did you call them?