If a girl who says "Hi" to everybody won't say hi to me most of the time?

Anonymous
So there's this co-worker I kinda like. She is a shy girl but after a couple of months she has been opening up and now talks more and seems more comfortable. One thing I've noticed is that she will say hi to everybody when she sees them for the first time during the day (which is common work related manners) but she won't say it to me most of the time, a lot of times we just start talking without a greeting. When she DOES say hi, is just that, a "hi" or "hello" but with ALL other coworkers she says HI and their names, I'm like "what? what's wrong with my name?" I'm a pretty popular guy at work, most people like me and we talk and joke around but she is just so nervous around me. SHe will make eye contact from time to time when we talk but most of the time she is looking down or "looking busy" while with other people she will look at them most of the time. SHould I just assume she doesn't like me much? She seems to have fun talking to me but she is just way too nervous and sometimes when we see each other she will give me this BIG nervous grin, makes me feel like a weirdo haha, any help?
If a girl who says "Hi" to everybody won't say hi to me most of the time?
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