YOu don't ask a girl out at 4 am while she is working at the gas station and has no way out. You should have given her your phone number and ask if she's interested in talking to you at a more reasonable hour. The ball would have been in her court to either call your or not.
There are all kind of creeps at a gas station at 4 am in the morning. Put yourself in her shoes and then tell yourself that you were right..... can't do that, can you?