chi le ha detto che

who told her that

→ chi
phrase Rare #32,749
who told her that Le usually means “her” here, but it can also mean formal “you”; the following clause states what she or you were told.
IT: Chi le ha detto che la riunione è stata cancellata?
EN: Who told her that the meeting was canceled?

Chi le ha detto che Tom lo farebbe?

Who told you Tom would do that?

Chi le ha detto che qui si realizzano i desideri?

Who told you that wishes come true here?

— Stalker (1979)

Chi le ha detto che ero canadese?

Who told you I was Canadian?

Chi le ha detto che Tom l'ha fatto?

Who told her that Tom did it?

Chi le ha detto che il mio nome era Tom?

Who told you my name was Tom?

Chi le ha detto che Tom non lo avrebbe fatto?

Who told you that Tom wouldn’t do it?

Chi le ha detto che ero tornata?

Who told her I was back?