AtD translation: Bria had gone cakewalking

[Mike Jing]

P523.34-38   Dally had expected Bria would be the first one to put her
through this, except that somehow, quietly and with no effort her mother
could see, Bria had gone cakewalking quite beyond any sound advice she
might once have offered, playing not only Root Tubsmith but a good part of
the fourth-class passenger list like fish in an ornamental pond.

What does "cakewalking" mean here?