Actually, it was from RotJ, after Luke and Leia know that they're siblings, at the Ewok party:

Quote:
Princess Leia: Luke, what's wrong?
Luke: Leia, do you remember your mother? Your real mother?
Princess Leia: Just a little bit. She died when I was very young.
Luke: What do you remember?
Princess Leia: Just... images really. Feelings.
Luke: Tell me.
Princess Leia: She was... very beautiful. Kind, but sad. Why are you asking me this?
Luke: I have no memory of my mother. I never knew her.

I could go on with apologies about what she was really talking about, but, really, it's just a mistake. They could have corrected it in EpIII by simply having Padme hold her for a second and have some indication of the Force imprinting her image, but the fact of the matter is that Lucas just doesn't care.
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Bitt Faulk