I don't really think one little rawhide stick will cause a blockage. I guess it is possible. If you are really concerned," get her x-rayed." Let her chew on elk antlers or other items like that. Never let her chew anything un-supervised. Symptoms? Could be whining, lethargic, drinking a lot of water, etc... Like I said, if you are worried take her in and get an x-ray. (this is just my opinion) But I think she should be ok.
"A House Is Not A Home Without A German Shepherd"