I have a good friend, Amy, so I have also tried to find information and there just does not seem to be much.
Here is what I have:
Feastday: February 20
Poor Clare and niece of St. Clare of Assisi. Amata was miraculously cured of an illness by St. Clare. She entered a Poor Clare monastery as a result.
Amata of Assisi, Poor Clare V (PC)
Died c. 1250; feast day formerly June 9. Amata was sister to Blessed Diana and Cecilia in the community of Saint Agnes at Bologna, a niece of Saint Clare, and a good friend of Saint Dominic. Saint Clare healed Amata of a disease and thereby converted her heart to the life of the cloister. According to legend, Dominic give her the moniker "Amata," meaning 'beloved,' and very probably sent her to the convent. This is all that is known of her. Amata is in the Franciscan martyrologies