How do you deal with people who don’t keep their word?

I am a very understanding person so I understand things happen, and things may come up. Every time my Mother and I make plans to go out of town or go on a road trip she always makes up an excuse last minute. I literally asked her the day of the trip are we still going on the trip she said yes I don’t see why we wouldn’t. So the day of the trip came she makes up a lame excuse. I’m not mad at her. I’m more annoyed that she does this every time. I’m starting not to trust her.
How do you deal with people who don’t keep their word?
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