I got stood up by my own sister, is this rude?

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Well, since last Wednesday, my sister and I have been planning a get together for yesterday, Sunday, and she never showed up. I had spent all day cleaning house and getting things ready for her to come visit. She was supposed to be over around 7pm. I had called her a few times before 7pm to see if she was still coming, although I was for sure she was, and she never answered her phone. I waited for her to call me back, until finally, around 7pm, when she was supposed to come, she called and said she wasn't going to make it, for some stupid reason. I was upset,although I didn't let her know. I just said "Okay, maybe some other time." I was upset for a few reasons. For one, I had spent all day cleaning, and wasting my energy, for two, she never answered her phone, and lastly, she didn't even call until 7pm! Do you find this rude? I do very much so. If she wasn't going to make it, she should have told me ahead of time instead of waiting until the last minute, then it would have been fine. How would you have reacted in my shoes? Would you have let it slide like me? Or would you have said something?