Are there any friends in the area who also walk at the same time? If she is meeting a peer to walk to school together, it may provide a different kind of motivator for managing her time.

When I was a kid, my mom had time limits on meals (some unnamed child in our family was a very slow eater!). She won't starve if breakfast gets put away after 15 minutes (assuming there is no medical contraindication to this). (Probably want a five minute warning, too.)

...pronounced like the long vowel and first letter of the alphabet...