Not entirely sure if this was brought up or not, but I'd like to see Adda with white hair (Adda the White) idk why they made her a red head
I don't recall Adda ever being referred to as Adda the White in the books. The only thing that I remember is the scene right after Geralt breaks her curse, where her hair is red:
"He scrambled from the sarcophagus, aching, numb, cold. And then he saw her. She was lying on her back next to the tomb, naked and unconscious.
She was rather ugly. Slim with small pointed breasts, and dirty.
Her hair - flaxen-red - reached almost to her waist. Standing the lamp on the slab he knelt beside her and leant over. Her lips were pale and her face was bloody where he had hit her cheekbone. Geralt removed his gloves, put his sword aside and, without any fuss, drew up her top lip with his finger. Her teeth were normal. He reached for her hand which was buried in her tangled hair. Before he took it he saw her open eyes. Too late."
EDIT: After some research, I realised that this is part of additional material Sapkowski released later on. I assume they kept her hair red so that they don't confuse foreign readers of the books, who do not have access to the additional materal.