Is this a sign of nervousness?

I'll keep It short, she's an outgoing bubbly person, we look at each other often, I've noticed her stealing looks as well, but when I Interact with her, she Doesn't say a word, I have to do all the talking and she just responds, even If she walks up to talk to me and I'm not paying attention, she'll just stand there looking at me until I notice, she doesn't do this to anybody else, has no problem saying "hello/hi" to every other person.
Is this a sign of nervousness?
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