[header] How to talk to a girl that you haven't spoken to in a while [title] Approach her in person. [step] If you happen to run into her in a public setting, you can choose to simply walk up to her and start talking to her. This by far the most direct approach, and might take some guts. 
However, you can definitely do it and pull it off with a little luck. When you approach her : [substeps] Stand straight with good posture.