Quote (mortwatcher @ 17 Oct 2014 17:56)
didn't like that Toph just quit like that, was quite unlike her
No, it shows she's matured. She won't waste her time if korra isn't ready to face the strain, because she's better able to tell when she should charge through obstacles, and when to just do nothing.
Does anyone remember the lesson boomie tried to reach ang, about why he allowed himself to stay imprisoned even though he could break out at any time he wants? I think Toph learned that exact lesson, there's a time to push, and a time to be passive and wait for the right time.