Is it a shit test or just disrespect?

GF and I have different plans today for the 4th of July and she asked what I was doing and I told her going to a BBQ and then going home after. I never asked what she was doing and she was telling me about how she got invited to go party with a friend of hers and that she thinks she’s denying the invite because she’s the only girl there. I just said have fun and that’s it.

Is this a shit test? What’s the way to handle these? I really don’t care what she does which is why I didn’t ask.