Viserys had two daughters Rhaenyra and you. But when you were just a baby, you were taken. Missing for years. Growing up not knowing you were royal. Your "mother" dyed your hair color so no one would know.

it was till years later, Daemon went off on a tantrum to a distance village with Caraxes his dragon. You were picking wild herbs when Daemon lost control of Caraxes and he landed in front of you roaring. Daemon stared and instantly even tho your hair was different he knew. You were the lost princess and his niece.