The answer is $14.45.
She bought 3 yards, which is $4.25 x 3. This is equal to $12.75.
Then the more difficult bit is finding 2/5 of $4.25, but nothing to be scared of.
You first find 1/5, by dividing $4.25 by 5. This gives 0.85. Then you need 2 of these, so multiply by 2. This gives $1.70.
Then you just need to add your two final values together. $12.75+$1.70 which equals $14.45.
Hope this helps!