It sounds to me like she likes you, and you’re paralyzed by your fear of losing control. I’d advise you to get over your fear, and see if she really does like you as a boyfriend, the only way possible — by asking her out and pursuing a romantic relationship with her. I know that rejection is painful, but it’s part of life, and frankly, you haven’t even gotten it from her yet!
Understandably, she’s healing from a long term relationship break up, and then a short term dating disappointment, but if she’s gone to the movies with you, flirts with you, talks to you at work, and has lunch with you at work, I’d tell you to go for it!
If she does balk and decide she doesn’t want to date you, you’ll live, and you’ll know that she’s not the one for you. But if she doesn’t balk, and is interested and wants to date you, then you’ll have found out something nice!
So, go for it! 🙂