East of the Sun and West of the Moon by Katrina

Katrina is back with part two of East of the Sun and West of the Moon. The white bear asked if it had all happened as he had said. Well, she couldn't say it hadn't. She told the bear she talked to her mother. If you have listened to your mother's advice, you have brought bad luck on us both. When she reached the castle and walked by the library that night, she saw the man again. He was a prince but the troll queen cast a spell on me to be a white bear by day and a human by night. Now I must go back to her in order to marry the troll princess.