help w girl

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I have a three hour class again tomorrow with a girl that I'm pretty sure is interested in me
>when she laughs at something she often looks in my direction (I read this was a sure sign on reddit)
>willingly sits next to me (even changing her seat to do so after the first few days)
>tries to make conversation with me
>she isn't in a relationship RN

the problem is I'm an emotionally retarded handholdless-virgin who freezes up when she tries talking to me. how do I make something more of the conversation when she says something like "I like your jacket"?

also she's a few years older than me and a fitness nut and could kill me with her thighs so it's a little intimidating

thanks anons