Why can't she eat peanut butter? If she has a severe or life-threatening peanut allergy, I'd be very careful about trying cashews. An allergist told me once that if he has a patient who is allergic to one nut, he cautions them about eating other nuts that they aren't allergic to because often they're processed in a facility that also uses the nut they are allergic to. So if you were allergic to walnuts, but not pecans, he recommended not eating any commercially processed nuts, but it was ok to eat pecans you'd shelled yourself, since you knew they weren't contaminated with walnuts. And the way cashews grow, I don't think you can get them "unshelled" like that. At the very least, I agree that you should buy the whole cashews yourself, since you might recognize any peanuts that happened to fall into the cashews, which you can't do once they're turned into butter.