How do I teach my girlfriend some manners without coming off as parental or lecturing?

Anonymous
She's a good person, but she has no respect for anyone. She even swears around her grandmother when her parents asked her many times not to. She claims it's because she's been through a lot and she's "done apologizing". Which is a very immature way of thinking.
She's only 22. So I can forgive her a little bit, being that her better judgement hasn't quite kicked in yet, but her disrespect runs off on me sometimes.

Like we made plans, then she basically ignored me shortly before we were supposed to meet up, and when I called her out on it she got all pissy and said she had a lot going on. It's like that's fine, but communicate that! A quick text is all I need, it's not that hard. Just to know we're still meeting up or if she needs to cancel.
It's that kinda stuff.

Anyway, she needs to learn some manners and learn a little respect, especially for people who care about her. I'm not ready to give up on her yet, but it will be a dumpable offense if it doesn't get better... soon.

I just don't know how to do it without turning myself into the bad guy
How do I teach my girlfriend some manners without coming off as parental or lecturing?
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