29 years ago when my daughter was born, we bought a crib vibrator device (I don't recall the brand name) that had been developed by a father who found that his daughter fell asleep if he drove her around at 55 MPH for a few minutes. So he designed an off-center motor that mimicked the vibrations of his car at that speed, that could be attached to a crib. My wife read about it, we bought one, and we found that it worked great.
Of course, taking my daughter for a ride worked too, but the crib vibrator was much more convenient.
As for walking her around, OF COURSE that works -- every halfway smart parent figures that out pretty soon. A little bounce in the step helps too.
I remember seeing a story about the crib vibrator. Mine was older by then but it made great sense to me. Glad to hear it worked