Don't dangle. Hold the rat behind the shoulder blades (scruff) with feeding tongs and hover it just outside the entrance to her hide. Make sure you hit the head with a hairdryer or heat lamp for 30 seconds or so before offering. Mine are so attuned to the hair dryer now, that I don't even have to open tubs to know who is going to eat - they are front and center and hunting, even the shy ones!
Oh, and if she doesn't hit it after 60 seconds or so, leave it with the nose pointing barely into her hide and check back in an hour or so.