Is this gaslighting?

I'm dating this girl and the other day we were talking and she told me that I will do certain things and then push it out of my head. She said, you will tell me you're gonna do something and then not do it. So in this case she was talking about getting her something from the store. Thing is, I legit never said I was going to get her anything from the store. She's done this a few different times with a few different things, like going to an event etc. I'm not a forgetful person, is this some manipulation tactic or just a misunderstanding?
Is this gaslighting?
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