Following Is an Example of a Child's Work $2 \frac { 5 } { 8 }$

Following is an example of a child's work. You are to study the work and then judge the student's understanding.
?
Rona was asked to subtract $2 \frac { 5 } { 8 }$
from $4 \frac { 1 } { 8 }$
. Her work is shown below.
$\begin{array} { r } \text { Rona's work:}&4 \frac { 1 } { 8 } = 3 \frac { 11 } { 8 } \\\\&\underline{- 2 \frac { 5 } { 8 } = - 2 \frac { 5 } { 8 } }\\&\quad\quad\quad\quad 1 \frac { 6 } { 8 }\end{array}$ ?
A) Is Rona's work correct or incorrect?
B) If the work is incorrect, please explain why.