She became the heir to her father due to the lack of male children.
She was born in Reborda, Portugal and married off to Constable Nuno Álvares Pereira.
They moved to Pedraça and lived in the manor known as "Casa da Torre".
When, in 1387, D. John I of Portugal called for all courts to report to Braga, Nuno Álvares Pereira was still there as a proxy for the noblemen of the Kingdom.
It was during that stay D. Nuno that he received information that Leonor was ill.