Would this be rude to you?

Edit- the call couldn’t wait because my MIL was in the store and needed an answer about the color. She took a bus to the store only to get this sleeping bag and was waiting for our answer before she could start going back home

As my husband and I started eating dinner last night (with our 5 month old baby), I had to call my mom because she told my MIL to go to a local store (she lives a few hours away) and buy my sisters new baby this expensive wool sleeping bag that she previously bought for my son. I know that’s a long chain of events. But my MIL called me and asked what color to get bc she was in the store & waiting for an answer from my mom but my mom was not answering her phone. That was the first I heard about it and my sister previously told me she did not want this sleeping bag. She doesn’t even have the right bassinet for it so she can’t use it at all. So I quickly called my mom and asked if she had been told otherwise. She hadn’t, so I texted my MIL and told her not to get the sleeping bag (& that my mom apologized for making her go out of her way for nothing). My mom was still on the phone with me asking if my MIL was mad, asking me all these questions about my sisters car seat, just endless questions about MIL and my sister. I said 3 times that I need to go bc I was sitting at the table with my husband trying to eat dinner while it was hot still. Each time after I said it, my mom said something like ‘oooohh what are you eating?’ or ‘ugh but do you think your MIL is mad at me?’ and finally I said omg mom I really have to go, my food is getting cold. I could have left out the ‘omg’ but it was just incessant questions and she knew I was trying to eat. The only reason this was an issue is because she’s very mindless and doesn’t pay attention to what we say and it caused this confusion. Which wasn’t really even a big deal. But when I said that, she hung up on me! I think that’s very rude bc I told her 3 times I needed to go, the first two times I was very polite about it. But I value my dinner time with my husband because it’s the only quality time we have sometimes with our busy schedules. Is this normal behavior of my mom?? If your mom just hung up on you would you be offended? Today she was texting me weird cryptic texts I’m guessing to see if I’m mad at her.