So, what's your question? Are you asking if this is normal? Are you asking if she's in pain?
If you feel she's in pain or she has broken or sprained something, take her to the vet.
My dogs back leg keeps going as though she has stood on something like a limp then she's ok again?
Arthritis, injury, stiff muscles would all have the same symptom .. It's exactly the same for people. If you are concerned about it, have it checked out by the vet.