Given the probable frustration of changing foods, the fact that you are already feeding her a quality food that she likes, with the understanding that she is maintaining a healthy weight and activity level, I wouldn't even think about changing her food. If it isn't broke, don't fix it.
We entered our endless search for a healthier food only because he quit eating his already healthy kibble. The boiled chicken treats my better half fed him transformed our little boy into a picky little brat.
