Mine is about 5 to 6 inches and I got her at the same size as yours. I have had her since January. She is still a solid pinkish orange color. One pic is not too long after I got her (Feb 6). The other pic is from early May but her colors are the same now. And her eyes are still red too.
She is also a very nice tempered and curious fish so far. I have a female gold saum and a male convict in there and they know enough to stay out of her way. She rarely chases them and it is only briefly. Like I said, they know better.
And her name is Bertha (no relation to the current hurricane).