Meh, she did a simple move that knocked them all over(that weren't paying attention to her) and writers made it so they didn't retaliate. Then she complained her back hurt. Her training match with Korra was more impressive.

I'm not talking about whether she is the best earth bender in the world, I'm talking about the fact that she let King Bumi outshine her as far as staying strong well into old age, and being able to kick young kids asses. It seems so out of character for her to stay on the sidelines and uninvolved.