Reached out to a girl on Linkedin that I met... Should I ask for her number?

We were on the train and she kept looking at me. So I got off with her and started talking to her, she was in a hurry to catch her bus, so I gave her my card. Didn't hear from her.

I reached out to her on Linkedin since we had a mutual friend and wrote it was good to meet her. She replied by adding me and wrote that it was great to meet me and she's glad I found her on there.

Now I can't tell if she's being polite or not. I am thinking about asking for her number and then asking her out.

Thoughts?
Reached out to a girl on Linkedin that I met... Should I ask for her number?
Post Opinion