what do i do?

Basically I have posted a similar question to this like a thousand times but I need help . Basically thee is this girl who keeps waiting for me outside class she is toxic and I hate her she always waits for me after class so we can walk together but I don't wana walk with her so I just went without her then she asks me why did I leave her I said bc I don't wanna walk with you cause there no point and she goes well we always walk together and then I said well I cba anymore and she goes fine I'm telling the head of year teacher that u don't wanna walk with me and I'm ignoring her ?? Will she really??? I'm freaking out