The comedian, 60, admitted she is "still reeling" from the death of her friend in February at the age of 53.
Appearing on Lorraine via a video link from Cornwall, the Vicar Of Dibley star said: "It's a very shocking and sad loss. She was far too young.
"And I think we're all still reeling from it a little bit.
"My memories of working with Emma are some of my most favourite memories of my whole career.
"She's a massively diligent person and much unlike Alice (Tinker)."
The actress continued: "She was also incredibly bright. Very funny, very knowing.
"And yet she was able to play somebody who was in a different world.
"She didn't play a simpleton, but someone who had a different reality.
"And she was incredibly authentic at that. I will miss that."
Lorraine Kelly interjected: "You just smile thinking about her. You really do.
"And you're right, she was in a different world to the rest of us."
Dawn revealed of her talented late co-star: "To play a clown in a way like that takes a lot of hard work.
"The bit where she says 'I can't believe it's not butter' she took a whole week to learn that correctly. Because the emphasis was very important."
The pair starred together in the BBC sitcom The Vicar Of Dibley during the 1990s.
In February of this year it was revealed that Emma had passed away from natural causes at the age of 53.
She famously appeared in the 1999 hit film Notting Hill alongside Hugh Grant.
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