>>She also had one eye which had different colors in the same eye.
I've got that. And my eyes change color (the irises, not the white part) depending on the amount of sleep/alcohol/wind they have been exposed to. Technically they are 'Hazel', but in my case they are almost mood eyes.
>>I bet different colors for each eye is really rare.
I believe they are very rare, but sometimes I think they happen when you get a sharp blow to the eye. For example David Bowie has that (one blue, one brown) which was the result of a punch to the eye.
http://www.straightdope.com/classics/a971205.html
My eyes are similar. They're hazel, but depending on what colors I wear, they go from bright green to dull brown. It is an odd thing.
One of my eyes is blue, the other is half brown, half green.