Overthinking ?

So I am not really sure how to describe the situation. I have been a regular for almost a year at a local Coffee place here as I do all my studies from that place. I got to know a girl here at this store which I find is really cute but I have a lot of challenges that have been preventing me from asking her out. But on the other side, its been almost 7 months that I’ve been wanting to ask her out and my feelings towards her hasn’t changed a bit.

My major concerns I guess for not asking her are simple:

1. Although asking her out on a date won’t mean anything serious but my status is still temporary and I could leave to another City/State at any moment. So I keep thinking, why attach someone to me when I might leave?
2. I feel it is inappropriate to ask her out since this is her work place. And If things go south, I may not be able to comeback and I like to go there to study. Plus I’ll make it awkward.

Now, I grown enough to understand that she gets paid to be nice but I believe we exchanged some signs, If you will, and I definitely missed out on a couple of opportunities as I have been preventing myself because of the above concerns.

So sorry for the long story, but am I thinking straight here? Should I try harder to just let her go even after all those months?

p.S: I have recently been going at times that I know she’s not working. But also a part of me wishes she walks in when i am sitting there.