Is it normal to be lost?

Here's the deal: I've worked at this place for almost 3 years and have known this shy, attractive girl for the entire time. She began dating some dude when I basically started working, and about 4 months ago, she has been single.

Now here's my problem/question: Ever since we've both worked at this place, I would see her maybe twice or 3 times a week. We would talk casually, maybe slight flirting. I have always adored this chick. Now that she is single, I have been trying to set something up to hang out. There are many mixed signals however. Sometimes it seems like she is kind of into me. The weirdest part is that sometimes her face will turn red when I talk to her. Is it that she is nervous, or is it that she digs me?

My other problem is that yes, she is shy. And since there are mixed signals, I don't know if she truly wants to talk or hang out. I hate texting, but that is what I'm confined to doing now, to contact her. How should I go about this? Is it normal for this to happen?

Thank you.