Hello, my daughter has different colored eyes. Heterochromia as I unde…

Hello, my daughter has different colored eyes. Heterochromia as I understand it. At first they were the same. Then one started getting darker. Some kind of green, maybe? In daylight on the street you can clearly see that there are specks in it. In the other eye it's straight up barely noticeable. Is it possible that the eyes just change color, simply one is faster? Or is this some kind of pathology? At first I also noticed but thought it was because of the light. Now it becomes clearly visible. Should I panic? Or rejoice at the peculiarity?)