Understanding 'Thrilled'

Maria was thrilled to receive an invitation to her friend's birthday party. She had been looking forward to it for weeks. When the day finally arrived, she put on her favorite dress and headed over to the party. As she entered the room, she noticed colorful balloons and a large cake decorated with stars. Everyone was laughing and having a great time. Maria felt a sense of excitement in the air.

As the party progressed, Maria joined her friends in playing games. They played musical chairs and pin the tail on the donkey. Even though she didn't win every game, she was having a fantastic time and enjoyed being with her friends. The happiness of the day filled her heart.

In this context, what does the word 'thrilled' mean?