Is she trying to stab me in the back?

Why does she talk about that she wants to introduce herself to him?

I’ve been talking a guy for some time now. We haven’t gone on a date yet. He’s very nice and seems to like to talk to me. I’m at a point where I want to make my feelibgs clear to him (I like him). My female cousin knows that I really like him. My crush is really handsome by the way.

when she sees in him public she talks to me how “she wanted to go up to him and introduce herself as my cousin etc”.
I told her that it would be weird since we aren’t even dating and official. I don't know if she’s envious that we are texting and getting to know each other.
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:)))))?
Is she trying to stab me in the back?
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