Call her or E-mail her!! She has left both of those doors open! Be polite, respectful, and open to further contact. If you're attracted, don't let a case of "cold feet" stall what might become a nice relationship. IMO, males' "fear of failure" kills most of their best chances at happiness.
Lest you think that this is a contemporary problem, please understand that I was in HS over 40 years ago, and it was a problem before lots of people in my area even had 'phones. Luckily, I had a couple of older girls (former babysitters) that were all over me whenever a new song came up at a dance, and for some reason younger girls would ask me to dance with them too. I was spared some of the "danger" of asking. Getting grabbed by a hand and hauled onto the dance-floor is a real ice-breaker.