No she actually didn't. Here's why.
TEACHER'S RATIO
Yellow 9 Yelllow 3
------------- ÷ 3 = --------------
Blue 6 Blue 2
I simplified this to make it easier to compare.
HER RATIO
Yellow 4
-------------
Blue 3
This can not be simplified any further.
The two aren't the same ratio. The Yellow to blue both need to be equal to what Gina's teacher had. Either simplified or on point.
So no, Gina did not follow instructions because her ratio doesn't match her teachers.
Please let me know if I need to explain it better.