How can I tell if my crush isn't interested anymore?

Anonymous
She normally shows me signs such as:looking at me when I'm not looking at her (sometimes while giggling), mimicking me, asking people she knows questions about me, showing concern for me if she thinks I’m in trouble, her friends act differently around me, sometimes she blushes around me, etc.

Last time I was over her house, the only things she did were looking at me (which seemed like more of a coincidence then anything), talking about how I got out of my chair the same time her brother did, and saying good night to me (which wasn't solely directed at me).

To top it all off, she refused (in a shy manner) to read something that I found on the Internet that was going to lead into me giving her a "promise to date" ring. Funny thing is though, she showed a few of those "signs" after I attempted this.

Has she lost interest in me or was it just an off day? After all, I heard her talking to one of her friends saying she didn't feel like herself.
How can I tell if my crush isn't interested anymore?
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