Did she do this on purpose?

I’ve been talking to a guy and we have planned to meet in 2 weeks ( he’s currently on a work trip). My friend who has thrown at me shady comments about our situation and has seem little jealous in the past. She knows that after two weeks on weekend I’m
going on a first date with this guy.
yesterday she sent me a message asking if I can attend to her little sisters birthday party ( same weekend that I’m supposed to meet my guy).
If I say yes I can meet this guy on saturday….
Did she do this on purpose?
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