in my experience, my big is a boy because it is a coed fraternity. so my big and i don't hug a lot but he is still there for me. if you really strongly feel the way you seem to, talk to your grandbig about it. maybe she knows why your big acts that way. maybe she can help by helping to guide you some more. i know my grand big, i call her bigbig, she helped me get to know my big a lot better, and now i would not trade him for the world.
all u have to do is communicate what u r feeling with your big. somehow get her to realize how you feel about things.
hope that helps