Her answer is wrong. You might spend an hour looking at her work....
but no! Her work is all right.
That line means those three digits are recurring - they repeat itself over and over.
But the pattern is 0.5454545454545454545... and so on.
Her answer?
0.545545545545545545545545545... and so on.
"0.545545"
VS
"0.545454"
is different.
So the actual answer?
0.54, with the line on top of "54."