My dog hurt her back right leg.?

You did the absolute right thing by icing her leg! I'd say keep her quiet - no running or jumping - and see if she's back to normal tomorrow. If she is, great, but if not, she needs the vet for x-rays. Some injuries get worse if the dog's allowed to use the leg. Not crying means nothing at all - a great many dogs are very stoic and don't let on they're in pain. She wouldn't be limping if she weren't in pain.