if you ask her out and she says no, just go on with life like it never happened and it wont be awkward. so you say "hey how would you like to get together sometime?" and she says "yeah i dont know about that..." just say alright that's cool too and play it off like it isnt awkward... easier said than done but it happens. even if its awkward for the rest of the shift, the next time you work together, pretend like you never asked her out and things will be fine, like they always were