Girls - can you help me figure out why this girl acts so strangely around me?

Anonymous
A girl in my class, who I am admittedly interested in, is doing the following:

She can initiate conversation with everyone else in our class but me. Regardless if it's a guy or a girl, she can initiate conversation with them AND seems to be able to keep it going.

She will occasionally initiate SMALL conversation with me BUT won't be able to keep it up. I've also tried initiating conversation with her but she seems to be unable or unwilling to keep it going for long.

I've caught her staring multiple times, in fact in group settings she's often on her phone but I catch her sneaking glances (and maintaining eye contact for a good portion) at me so I stare back when she does.

What's going on here? Is she just not interested or what? I tried joining in on group conversations to make sure it's not awkward or anything mutual friends, and she'll seemingly avoid looking in my general direction at all, sometimes turn half way to me or her back to me but then will still sneak in glances as I converse with others...
Girls - can you help me figure out why this girl acts so strangely around me?
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