I have never seen anyone more truthful than Faṭimah رضي الله عنها other than her father. And if something happened between them (i.e. Prophet صلى الله عليه و سلم and A’ishah رضي الله عنها), A'ishah would say, ‘O Messenger of Allah, ask her (Fatimah) for she does not lie.’
 
Mother of the Believers A’ishah رضي الله عنها [Ḥilyat ul-Awliya’/1486 – muttaṣil, the men in the isnad are trustworthy]