Falling for her, but confused at the same time

So I've been falling for this girl for the past number of months now. We've known each other a while now, but I've grown fond of her. I added her on Facebook and messaged her pretty frequently. However, when I ask her out to the movies as a date, she just stops responding. But, she sometimes video calls me by accident, or at least she says it's an accident. I've texted her a few times over the last couple days days, and she has read my messages, but no response. What should I do?