I was invited to a baby shower that is out of town and being held at an Airbnb ( w/ owner's permission). Then baby shower is for a niece on my husband's side of the family. My SIL, niece's mom, sold the weekend like a girls weekend, but it turned into a more "spend time with grandbaby and daughter" weekend leaving me stranded at an Air BNB with my MIL ( not related to SIL) and my other SIL, her husband and dog. My MIL is annoying AF, and my SIL knows this but when my MIL started to fuck with the room assignments, my SIL decided to forfeit her room and stay with my niece and her grandbaby instead of the Airbnb. She has offered me an invitation to come run errands with them for the baby shower, but was not able to pick me up. I was to Uber and meet them at whatever store they are shopping at. I was invited to join them all day, but never offered to be picked up. Side note: SIL failed to tell me that she was relying on her daughter for rides. So I was super surprised when we got the airport and didn't pick up a rental car. I don't have a CC so I couldn't rent one myself. And in this town you need a car. My niece showed me on day one all the crafts she wanted to have done for the shower: jeopardy, diaper pong, and a book raffle. She had all the craft supplies sorted out and projects sorted out. She was very stressed and I told her that I would help her. The baby shower is on Sunday (today) and on Saturday my SIL refused to come back to the Airbnb and was babysitting her grandbaby, my niece and her husband were given a day off and were out around town, my MIL and SIL also had plans. I was left at the Airbnb with out a car, stuck with crafts. I finished the jeopardy and diaper pong. But we are expecting 30 people tomorrow at 11am and there is a ton of food to prep, a backyard to sweep and rearrange. My SIL and niece met up with my MIL, SIL, and I for dinner and told us, "be prepared, I'm coming in early to start preparing for the party." AITAH for not wanting to help and hoping it fails? I feel like I was flown in to be staff and not guests at this party.