So my sister asked her MIL to host her gender reveal party and baby shower for her first baby. Recently, I experienced my own pregnancy loss and would have been hitting all the same milestones as my sister if I were still pregnant so this has been particularly challenging for me. However, I asked my sister’s MIL if I could help with the shower so it would keep my mind occupied and me out of my feelings. She had asked if I would do a balloon arch for the shower and I told her I would help out with one because they are a pain to make on your own. So I asked if we could get together to do the arch the night before the shower and recruit my other sister to help me because I couldn’t fathom doing the arch the day of. She then got weird and said that she would just blows all the balloons up and bring them the day of, and the arch that she had in mind was different than the one I suggested (even though it was based on the reference photo my pregnant sister sent me). She basically said “thanks for offering but I’m going to do it my way.” Great. I was totally fine with that because truthfully I hate doing balloon arches. Then, 5 days later she asks me to either come get the balloons or that she could take the ones back that she purchased and I could get my own. I was like oh ok, but offered anyway to either get the balloons or buy my own whichever was easier. I then asked again for her to send me reference photos for how she wanted the arch to be done. I got no response after that so I collaborated with my sister and decided to get the balloons she thought would be best to make the arch. Fast forward to the night before the shower, I have the arch finished and it’s absolutely gorgeous! I ask my sister to text her MIL to ask when I can get to the venue to set it up and she absolutely loses her mind. Accuses me of being disrespectful and “ruining” the whole theme because my arch is “not even remotely the same colors.” Spoiler, they were exactly the same colors. She said that SHE wanted me to do it HER way and that the arch I made would have to just go in the back corner. I was so confused and thrown off because I was genuinely trying to help but she said that I should have communicated with her what I was getting, even though she never texted me back after my last message asking how she wanted me to do the arch. I felt so hurt and idiotic for even making the damn thing and tried to apologize for the miscommunication, but she proceeded to be passive aggressive and rude to me the whole day. It was awful…so, am I the asshole for making this arch on my own? Or should I have reached back out to get clarification even after she never responded to me? I feel like she hates me now and I couldn’t care less if it wasn’t for my sister being caught in the middle.