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They need to be homozygous for snowflake and be appaloosa to show snowflake spots. So yes, she is a carrier, at least het, but can't show it because she has no Llp to 'switch on' the snowflake.

Gotcha. Yes, if they have snowflake, even if they don't express it, whether because they're only het or because they don't have Llp, (or both!) they can still pass it along to their offspring and it can hide unseen for multiple generations.

KAM, think of it like chestnut horses passing on their Agouti alleles. They don’t express bay or brown or whatever, but they pass it on to their offspring. Similarly, this girl can’t show her het snowflake pattern without another copy and appy, but she can pass it to her babies, so if you breed her back to a brother with appy, (or another snowflake/snowflake carrier stallion with appy) then statistically some of her babies will be snowflake appies!