How can I progress with her?

[Hunter38]

At the beginning of march a new girl started working in my local petrol/gas station. The first time I saw her it was her first day on the job and was still trying to figure out how to work the till. We had some friendly chat and when she went to tear the receipt off, she pulled the whole roll out the till and basically broke the machine LOL!! She got a bit flustered and embarrassed but we both had a good laugh about it. So straight away she remembers me as the guy who she screwed up infront of lol!!

 

This was about 3-4 weeks ago and I hadn't seen her since, but I went in yesterday and she was there. I wasn't sure if it was definitely her but when she started trying to work the till it was obvious she still hadn't a clue lol!! I said "are you the girl that destroyed the till the last time?" and she replied "OMG was that you!?!?! Hahaha I've been waiting for you to come back again!!" again we had some friendly chat and I paid and on my way out she shouted "see you later" in a happy sort of voice. She is a very cute girl and I'm not usually very confident when it comes to girls, but I think that because she embarrassed herself that time makes me a little more at ease with her.

 

The only problem is that I don't know a thing about her! I don't know her name, where she lives, how old she is (although she is roughly my age) and most importantly if she has a boyfriend. The one thing I know is that her younger brother also works there and I see him alot more often than her. So what should I do now? Anyone got any good lines or conversations? Should I just ask her out the next time or continue chatting with her for a while to build up a rapport with her. The only problem is the gas station round the corner has cheaper petrol so I usually go there instead. I just don't have the money to continuously go to her station. So I may not see her for another 3-4 weeks again. I can't stop thinking about her and it's driving me crazy!!! Any help much appreciated. Thanks guys.