My sandboa won't eat frozen pinkies??? HELP!?

I have a baby sand boa she is probably about 6-7 months old and under one foot long if that, she has beautiful markings and bright. She will not eat frozen feeder pinkies no matter what I do, when I first got her she ate 1 and that was in november and then again in the beg of jan. She has been vet checked and she is healthy. I do not want to feed her live, does anyone have any tips or tricks that might get her eating, as I am getting a bit worried. She is starting to loose weight. Thanks so much!!!!