Why does this woman at work avoid me?

To preface my situation, I am a very young looking 61. Often mistaken for late 40’s. Fit, average looks. She; late 40’s-early 50’s, attractive and Dominican.
We have been working together for about 2 years. Not closely but see each other throughout the day. In the last 6–8 months we’ve talked a lot, eat lunch together, have nice conversations. She was always very open and friendly. So, about six weeks ago I finally got up the nerve (very shy) to ask her out on a lunch date. Told her i would really like to get to know her better. She smiled, a slight chuckle and a yes. Two days later..absolute, complete avoidance. No response when I ask her what’s wrong. Will actually go out of her way not to be near me. I asked a friend what’s up with her and he told me she was married. She never, ever mentioned a husband. In fact, were’s no ring, uses her Spanish last name. The only “home life” she talked about was her teenage daughter. She goes back home (DR) with only her daughter for vacations.She works a lot of OT. 60–70 hrs. a week and appears to have little or no social life. I left a note of apology on her windshield stating I had no idea she was married and would have never put her on the spot. That I liked her, respected her and would never intentionally hurt or embarrass her. Also said I would respect her apparent wishes not to have further contact with me and have kept my word. Now, I’m avoiding her as well. Awkward to say the least. I have serious doubts she’s married. Maybe separated or going through divorce? I am at a total loss what I did to make her feel such disdain or dislike for me. Help! I still really like her. Am I crazy? What’s her problem? What did I do, or didn’t do? Did someone give her bad info or advice? However, I do know Dominican women can be very independent, hard-working AND stubborn.