Girl I like comes to my work. Suggestions?

I work as a service advisor and this one girl comes to my work a few times a year. I have a good rapport with her and talk to her. This girl and her mom always tell me that they love me and if I ever get a new job I need to tell them. I have her on Facebook as a friend but she does not use it much. I've told her different things about I'll help wash your car for free and give me a call. She tells me I'll do that but never exchanged numbers. I also asked for her insurance and registration cards when she was getting her car inspected and she told me I'm not sure what they are. I asked if she needed help and she said yes. So I followed her to her car. Even those most people just get them theirselves. I know a little personal stuff like she will never get married according to her and she likes Buddha statues. Other then talking at work or on Facebook ( does not use much). I never asked her out because to me the timing was never right and did not feel doing it at work was right. I wanted to get closer and possibly get a relationship with her. I think it could work but do not know if she just think of me as the nice men/boy at x job who help me with my car. I was thinking since I have her address from working at my job. I was thinking of sending her flowers with a nice note to it. I do not know if doing that would be considered creepy no matter who it was receiving them? Maybe you have a better suggestions then that. Let me know your thoughts.