M.D.
L.,
You are wonderful and very thoughtful. Maybe your sister-in-law comes from a different up-bringing. I am not always good about sending "Thank Yous", but I always appreciate everything that I get. I have told my sisters who sent me clothes "thank you" via telephone instead of sending a note. However, my oldest sister always sends notes of "thank yous". Don't be upset that she re-washed them, I would have done the same, they are being shipped across country and just to be on the safe side I'd re-wash. One time I didn't with some clothes my sister sent me and my son broke out. I know she wouldn't have sent dirty clothes.
I have an Aunt, who sent my kids some stuff for Christmas one year, and because I didn't send a Thank you back to her, she didn't send anything to them the next year.
You can't let it bother you, she probably doesn't even know she has offended you. Just remember that your act of kindness goes a long way, you did a great thing, and you truly did help her out. 7 boxes is a lot, and I know shipping isn't cheap. You know her better than any of us, she could be just ready to have this baby and not thinking, now she might be inconsiderate and this isn't the first time, only you know. Don't let her steal you JOY! You really did it for your niece or nephew...