How did the Maids of Honour come to know that the Princess and the bird had become intimate friends?

When the Maids of Honour brought breakfast for the Princess in the morning, the little bird quickly began eating rice out of the Princess’s hand and also had his bath in her saucer. Consequently, as he again began to sing a melodious song, the Maids of Honour became aware of the intimacy that had grown between the Princess and the bird.