If your child's teacher has told you as a parent, in so many words, to "not get involved", I would get involved - with that teacher's department head, the assistant principal, principal and/or superintendent. OF COURSE parents are supposed to get involved in their child's education.
To the real question, 9 years old is about 4th grade (give or take a grade depending on where the cutoff is on birthday for each grade. According to http://www.time4learning.com/fourth-grade-math.shtml, 4th grade is pretty much on track for teaching kids fractions. 3rd grade is mostly about mastery of basic arithmetic, and starting to chain multiple operations together (i.e. what is 5x3+2).
If she's having problems, I would see if there's another way to explain it. Try using fruit; slice an apple into 4 (or 6 or 8) pieces, then give the child one piece. Explain that that the piece they have is one of the eight pieces that make up the whole apple, and so it's one-eighth or 1/8. Then give them another piece. They now have two pieces out of eight, or 2/8. I'm not sure if they need to know about least-terms yet, but if they do, put pairs of the pieces together and show that their two pieces, plus pairs of the other six, can form four portions of the whole, of which they have one, so their two eighths is also equal to one-fourth of the apple. A lot of times, kids don't get numbers because they don't see what the numbers represent. If you put it in terms of something real, that they can move around and see the numbers in action, it can make a world of difference in their understanding.