How can you tell if a woman is interested in you?

Okay I was at the mall getting my haircut from a new place since my other place was full and the stylist (hot vietnamese chick) that I got just started asking questions like what my name and I reply back and just chat it about random things. After she finish giving me a haircut, she wanted to shampoo so we shampoo my hair then all of sudden she ask me. How old am I and I reply back and then I ask why. Then i ask her if she was single or marry? She told me she was marry before and we went back to the chair to straighten my hair and I just left paying for my haircut and giving her a five dollar tip. P.S. I got her name but no number

So I wondering if she was flirting with me or just playing with me, but what if she wasn't playing and got an interested in me. Should I go back to the salon and ask her out or try to get her number maybe. It just I'm so confused. I would appreciate the help or any advice at all. Thanks