Girl is pissed at me for ignoring her?

So I knew her for a few months, and just recently she showed signs of liking me, giggling with her friends when I'm near her, saying hi to me alot, and trying to start a conversation. I'm not much of a talker so I'm not good with small talk, so I don't know what to say. One day she just looked very uninterested in me. Like saying a few sentences, Not keeping the conversation going, and even talking over me and not letting me finish my sentences. I don't know why she's upset. I'm just a shy guy with not much to say. Is it too late to late tpo break the ice. She's a good woman and I want to stay on good terms with her.