Full Idea
In her middle period she changed her mind, and attacks moral rationalism.
Gist of Idea
Reason is not a motivator of morality
Source
report of Philippa Foot (Morality as system of hypothetical imperatives [1972]) by John Hacker-Wright - Philippa Foot's Moral Thought Intro
Book Reference
Hacker-Wright,John: 'Philippa Foot's Moral Thought' [Bloomsbury 2013], p.5
A Reaction
That is, she doubted whether moral reasons are sufficient to motivate moral actions, which presumably therefore need desires, as the Humeans claimed. Reasons rely on merely hypothetical rules.
Related Idea
Idea 23684 Morality gives everyone reasons to act, irrespective of their desires [Foot, by Hacker-Wright]