Is there any books on Queen Barbara of Braganza ? 
I don´t know...I never had seen a bio of Barbara.
All the information that I can provides you is the next following:
-Maria Madalena
Barbara Xaviere Leonor Teresa Antonia Josefa de Braganza was the first creature born of the marriage between Joao V, king of Portugal, and Mary Anne Josepha of Austria. Barbara, as she was usually known, was heiress presumptive to the Portuguese crown until her mother gaves birth to a prince.
-Barbara was married to Fernando the 20.01.1729 at Badajoz. She was eighteen years old, and her husband was twenty years old. The first time Fernando saw Barbara, he was horrified, but the girl was really fat and ugly.
-Barbara was a good person who had received a fine education. She has two thousand books in her library and she loved music, in fact, when she moved from Portugal to Spain, she was followed by their music´s teacher, the great composer Domenico Scarlatti.
-Fernando was by temperament really shy and melancholy. The lost of his mother caused much grief and pain throughout of his life. He was very fond to his elder brother Luis, and the dead of Luis caused him sorrow. He needed a kind and warmth wife, and Barbara, the ugly Barbara, was devoted to him, so he felt in love. They spent a lot of time at Aranjuez palace, because Barbara suffered a severe asthma, and she felt better when she was at this place.
-Fernando was sterile, so they had no children. After the death of Barbara, all the money she had (and she had a lot) was to her brother Pedro of Portugal. The widow retired to Villaviciosa, and mourned her during a year, falling into madness, until he die.
