Why did my friend go silent after I excluded her from plans with my guy friend?

I do sense that she likes him, as each time they’ve been around each other, she’s hit on him for sex. I didn’t include her in the invitation to catch up with us this time, because she tries to turn my friendship with my guy friend into a competition and it’s starting to irritate me as I’m not competing and I sense that she’s making my guy friend uncomfortable by repeatedly trying to leave with him when it appears that he’s not interested; because she tried to give him an ultimatum of choosing between riding home with her or with me and he caught my bus. I honestly just wanted to go home at the time.
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She catches up with her guy friends without me. So I don’t see the issue when there are other places they can both go to where she knows he’ll be and I won’t be and she can hit on him there?
Why did my friend go silent after I excluded her from plans with my guy friend?
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