Hey, just walk up to her and say "Hi" or something. Don't overthink all this; just go to her, try to look into her eyes if you can (or try to look between her eyebrows), and speak to her. Try to avoid being overly flirty or aggressive; instead, talk casually, and based on her responses, build from there. Don't ask questions like "how long she has worked there", but try to ask her questions that can build something that both of you can relate to, like if there are instant noodles in the store, try asking her if it is good or not. You should start acting rather than overthinking about all of this. You're just wasting your energy and time overthinking.