There is genuinely no bigger issue between me and her - I do like her and we get on well when we meet up. I was happy to help out and didn't expect, or want, fawning thanks. My irk is that i was omitted from the card she sent - despite it being a joint decision and one which would affect our family outgoings if she had a problem making the rent. Petty - yes, probably, but I feel the way I feel - unreasonable or not. I do agree that my husband could have contacted her to say "don't forget to thank lucky - it was a joint decision".
She does not live in poverty, she has a nice home and good financial support from her ex partner, a wide circle of friends, a new partner and a loving family. The decision to leave her ex partner was hers and was amicable. She is a nice person. I am a nice person.
I certainly do not ram my earnings down her throat. My comments when she tells me how lucky I am are actually based around our working hours, not money per se. However she, and the whole family, ARE well aware of our financial circumstances. They know what job I do (it is incredibly stressful with very long hours - hence why I get annoyed to be told that I am so lucky when my husband performs a simple household task). They know that I would prefer to be at home with DS but don't have this option. She feels that I am lucky. I feel that she is lucky. We both have things to be lucky about, we both have our own hardships. I make this point. Not "...but I earn all the money!", as has been suggested. She knows this - I don't have to say it.
I AM annoyed with my husband, as he doesn't do or say anything to support me and my contributions to the family when there is an opportunity to do so - like with the lunch. However, he is not party to the "lucky" conversations, and I wouldn't get him involved.
In terms of taking her out for lunch - there is no point to be made - it is not a passive aggressive act. This is something that we do as a family on special occasions, or when there is something to celebrate - like a new home. We have equally been taken out to lunch ourselves. I only made this point to illustrate that we would indeed be "wishing her well in her new home", as was advised by a previous poster.
My AIBU is about the card. I just feel that it was rude. Probably not intentionally so, but I still found it hurtful.