Read the following text, and then choose the correct answer.
Title: Ande Ande Lumut
Once upon a time, in a small village in Indonesia, there lived a poor widow with her daughter, Ande Ande Lumut. They were very poor and struggled to make ends meet. One day, the widow decided to send Ande Ande Lumut to work as a maid in a rich family's house.
Ande Ande Lumut worked hard and diligently. She never complained and always carried out her tasks with a smile. Her employers were impressed by her dedication and kindness. However, Ande Ande Lumut missed her mother dearly and wished to be reunited with her.
One day, the village announced that the prince was going to have a grand wedding. Everyone was excited, and the prince's guards went around the village, inviting all the girls to come to the palace to be considered as the prince's bride.
Ande Ande Lumut desperately wanted to go, but she knew she couldn't afford the beautiful clothes and accessories that the other girls would wear. With a heavy heart, she continued her work.
On the day of the wedding, Ande Ande Lumut sat alone in her small hut, feeling sad. Suddenly, an old lady appeared before her, offering a beautiful dress and accessories. Ande Ande Lumut was overjoyed and thanked the old lady.
She quickly put on the dress and went to the palace. The prince was mesmerized by her beauty and kindness. He chose her to be his bride, and they got married that very day.
As Ande Ande Lumut stood beside the prince, she asked him to grant her a special wish. She wanted to see her mother. The prince agreed and sent his guards to bring her mother to the palace.
When the widow arrived, Ande Ande Lumut ran to her and embraced her tightly. The widow couldn't believe her eyes. Her daughter had become a princess. They all lived happily ever after.
Question:
What is the main theme of the folktale "Ande Ande Lumut"?