lol I find it quite funny too...
my mum's had a funny exchange with a horny guy on her cell phone once via text messages, no idea how he got her number... so yeah, you could double check if it even was her - or do something like Twiggle said, stop by and chat, 'Hey I met a great guy the other day, we're meeting up tomorrow, name's Hank - he's a masseur...'?

'Wanna double date?' (you could show pic of a hot guy, body-builder or such?) Okay, that's just me being mean a bit.. if she'll start cracking up or look guilty, you could find your 'prankster' - if she'll just look 'off' possibly she had nothing to do with it? (but then your chances of eternal bliss with her are probably off... lol)
maybe it's better to stay away like others said... or make sure you improve her impression of you.. (if it's possible) in the future, it's better if you get the girl's contact, yeah - maybe e-mail or FB contact if she doesn't like to give out her number..
someone told me he used to get called a lot by people who wanted to get the vet's office (similar numbers in phone book) 'just sayin'...?
(maybe there's a 'hot girl' out there wondering why she hasn't got any messages??

)
if she really did put your number on Craiglist, it could be for the lulz, or out of being mean (a bit, or a lot - we don't know the girl!)
some girls really get hit on a lot, like waitresses etc, so you need to make a good impression to even be considered... or she may be 'taken' or into other types of guys (or girls)...
Basically I wouldn't decide before finding out if she really did it at all... You could also come up to her and say something like, 'So you put numbers of all the guys you're dying for on Craigslist?' and see how she reacts lol..
maybe she's just really BORED in that store!! lol
(but yeah, it's probably illegal and not really 'wife material', hm!)