Question about wedding gift etiquette

Hi Reddit -

I got married last March. I didn't grow up with a sister and as a sincere effort to get closer to my husbands sister I asked her to be my maid of honor. When I asked her she was 4 months away from delivering her 1st baby. She said she'd be "happy to be my maid of honor but just know that I'll be really busy for the first 4-5 months of planning". That was fine with me since we had over a year engagement, I was working with a coordinator and had friends that already wanted to throw my shower for me. I told her that was "no problem!" all I really wanted was "support on the day of, someone to keep me calm, make sure they know how to fix the bustle on my dress and make sure the other girls ordered their dresses". She wasn't much help during the year of planning, but I expected that. The weekend of the wedding came and I gave her a very nice gift to thank her for being my maid of honor. On the day of the event, she came to the house where everyone was getting ready with her 6month old baby. She was angry all day (because she didn't like the babysitter we had hired to look after her son). She went through her makeup and hair appointment fairly quickly (that was my gift to all the bridesmaids) and disappeared. She was no where to be seen while I was getting dressed and ready. Everyone kept asking me "Where's your maid of honor?" and thankfully my other bridesmaids stepped up to fill that role. I did notice she was being fairly absent minded that weekend. She even forgot to say goodbye at the end of the night. Three weeks later she told us she was pregnant and had been 5 weeks pregnant at the wedding. That was great news! I never held any of the "absent maid of honor" stuff against her, but something keeps bothering me. It's been almost a year since we got married - and she never got us a present. My husband and her are best friends and it doesn't seem to bother him. Is it wrong that I feel so hurt by this? Sorry for the long story - I wanted to give some context to what I'd be asking.

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