What do you think I should do?

If it were me I would start slowly. I would ask her out by saying it's for all the help she has given you and it is your way of saying thank you. Let the pieces fall after that, if she is at all interested in you, she'll say yes at the first request. If things go really well then make it a weekly thing and progress from there. Friendly conversation can lead into other areas. Good Luck!