Girls, what does it mean when a girl nods her head after I looked away from her staring at me for 4-5 seconds?

This girl stared at me, then I noticed and looked into her eyes for 5 seconds and then I looked to the side of her and away. She then nodded slightly while looking elsewhere. We were sitting close this time by the way. I noticed her staring at me many times but all those times she looked away fast.
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+1 y
Why did she nod after that?
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+1 y
Nodding up and down by the way.
Girls, what does it mean when a girl nods her head after I looked away from her staring at me for 4-5 seconds?
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