Female coworker being nice, or does she like me?

I work in a grocery store and this guy works in my department, he has a younger sister that is a cashier. Most of the time when it's time to clock in, I walk in the entrance, she see's me and immediately asks "Hi (name), how are you". I reply with "I'm okay". One other time she comes in the isle i'm working at to have a conversation with her brother. She asks me "Am I entertainment?" I say, "uh yeah...". She then says "Me and (name) are practically best friends" and "(name) likes the sound of my voice, he doesn't have to deny it". She also mentions that she's having a cook out at her house over the weekend and asks if I wanted to go. I replied with a "I don't know". I don't know why she says I'm practically her best friend, I don't really talk to her, I only respond when she talks to me. Is she just being friendly or does she like me? LOL. She's really cute and attractive, but she has a boyfriend. Also, I'm scared to talk to her or look at her in the eye's because attractive girls intimidate me and make me nervous LOL. Am I overthinking this or should I just forget about it. Update: Today, her and her brother was in the back room with me and my team leader and she asked me "are you glad i'm working with you tonight?" Of course I looked at her and mumbled "I don't know" and walk to a different area. I really do think she's trying to get me to like her or maybe she likes me? wait...her bro works in the same department as me, that's probably why she's being nice. She knows I'm shy, man...why do I have to be so socially awkward, I wish I can socialize normally. I hate being like this.

via Social Anxiety Forum http://www.socialanxietysupport.com/forum/f35/female-coworker-being-nice-or-does-she-like-me-395345/