If you really like her then fine, I'm going to skip past the ethical arguements about WC because others have already covered those subjects. This is what I remember from MANY years ago working an a pet shop that sold wild caught BPs, hopefully things are better these days.
Ticks - they all seem to have them somewhere, and it takes months of multiple treatments to get rid of them for good.
Parasites - assume they're in there, and be prepared to do regular fecal exams and treatments until the gut is in good balance.
Feeding - the fact that she has not eaten is a red flag for me, most of the WC snakes I saw back then would starve to death, but we also didn't have ASFs readily available then either. You need to be prepared for a potentially lifelong ASF eater. Until feeding is resolved, the parasite treatment issue is also going to be complicated.
I'm not saying she will definitely have all of these issues, but you should be prepared for the worst case scenario so you can go into it knowing what to expect. Sometimes that animal is just "the one," even when it goes against rational thinking, the heart does not often speak to the brain (at least mine doesn't). If you really like her, and are really prepared for all of her potential baggage, then go for it.
ETA - I don't remember any of them being particularly snappy, they were pretty shy.
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