Well, at this point being bolder isn't that hard. Ask her out somewhere, show your interest. If you dont do it soon, it might be too late. At first you cant let a girl work too hard for it, you gotta let yourself out there and if she bites, gradually make her work harder and harder. You wont know where this is going to go until you take the leap.
Im not going to go into specifics because that's better coming for you so you can plan a venue and specifics but just make sure it's fun and lowkey, an arcade or a place where you two can walk around and keep it light. Let her know what's up. If a girl is truly interested in taking it further, she will give you all the necessary opportunities.
Dont hint towards a relationship with her for now. Your simply "interested". You're giving her an audition of sorts

Whether this be the case or not, she doesn't need to know the truth. It's important that you pursue this with some intensity.