The formula for the chance of getting at least one of what you want is 1 - the chance of the entire clutch failing to produce what you want.

In this case, het X het gives a 25% chance for each egg to have an albino. So the odds of an individual egg missing are 75%. The odds of all 7 missing is 0.75^7 (in Scientific view the Windows Calculator has an X^Y key that can calculate this by entering ".75 X^Y 7 =". So, the odds of not getting any albinos from 7 eggs from het X het are 0.75^7 = .13 = 13%. Sure you had an 87% chance of getting one or more albino if both of these where hets but the 13% chance of them missing on a 7 egg clutch even if they are both hets isn't that far out there. Some one just hit on a 1 in 1024 chance of producing 5 female pastels from a 5 egg clutch of pastel X normal so your approximately 1 in 7.5 chance of missing on albino isn't that long of a shot in comparison although of course disappointing.

Of course she might well not be a het. I've seen plenty of people who just didn't understand possible hets so turned them into hets.

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