it depends... if you are a regular with her, chances are she’ll recognise you... and of course the right thing to do is at least greet or acknowledge her, but keep it at that (doing anything extra like buying her a burger is up to you, or maybe even going on an impromptu date if you have lots of time)
otherwise, then best to walk past by and not do anything
it’s a bit obvious if a person on the street is looking at you like he/she has seen you somewhere
![](//eforum.cdn141.com/images/smilies/tongue2.gif)