AITA for being frustrated with my MIL?

Let me start this off by saying that I love her dearly. She’s basically a surrogate mother, I have a very strained relationship with my own Mom and she’s filled the roll in every way possible since I’ve known her. She’s always there for me and for me and my husband’s baby that’s due in a few months. She goes to appointments my husband can’t make it to. She does everything we ask for help with. She’s currently planning our baby shower.
That being said, she has one flaw that really gets to me. She cannot be on time for a single thing. Ever. Everything she does is always last minute and it affects everyone around her. It got to the point I started telling her my appointments were 15 minutes earlier than they actually were because she would show up at exactly my appointment time (which as you know, you should be about 10 minutes early to). She was late to our wedding and wouldn’t have made it if the courthouse wasn’t a few minutes behind schedule.
Now onto the baby shower. It was supposed to be mid February because I’m due in the beginning of April. She procrastinated booking the hall for it so now it’s 3 weeks before my due date. That gives me barely any time to set up the nursery and get everything set up as my husband works out of town Monday through Friday and I’ll only have his help for 6 of those days. She lives an hour away from us so it’s not like she can come over every day and help, and I have weight and movement restrictions due to pregnancy complications.
I’m trying so hard to be grateful she’s throwing our shower and i truly am, but I’m frustrated that she put it off. I haven’t expressed how I feel about this as I don’t really see a point, its too late to change anything. But am I wrong in being frustrated?
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