Why does she giggle when I talk to her?

ABCshake
I've only known this girl for a couple of weeks. So almost every time I talk to her she giggles or gives off a faint smile. Should I think she's interested or is it something else. I keep thinking there's something on my face (lol). She only does that when her friends are around. But the thing is I barely talk to her in person. I'm thinking I should step up and try to engage her but I'm not sure if I should show interest. Please let me know what you think
Why does she giggle when I talk to her?
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