Sorry for you if you're allergic. Two of my cats had this habbit, but they did it only on special clothes. None of them got rid of it ever. We enjoyed this habbit, this was a proof of their trust, it's just like kneading. Our Naomi was my father's favorite, because of this.
A piece of advice - might sound a little cruel. Try some chilly pepper powder or hot paprika on that place where she uses to suck. Hopefully, she won't get upset with you for that