OP she will be fine, we used to pop our rabbit in a well ventilated shed or garage when it got really cold, so that might be an option, but if not, put the hutch in the most sheltered spot you can find and insulate it well with any old fabric, sack, carpet,
tarpaulin etc that you have around. Ours used to have a "curtain" for night time too so that she was kep out of draghts and no snow or rain ...