Answer:
Dispositional attribution
Step-by-step explanation:
Dispositional attribution also called internal attribution is the tendency of inferring that a particular event or behaviour is caused by internal characteristic rather than outside situations. Internal characteristics and psychological traits such as genetic traits, moods, attitudes, decisions and judgments, abilities, or effort are linked to the cause of an individual's behaviour or response.
Rebecca's disposition about Fiona was based on her perception of Fiona's internal psychological traits of feeling too busy and important.