The 36-year-old actress has been raising her 11-year-old daughter Matilda, whom she had with "The Dark Knight" star, on her own since Ledger died from an accidental intoxication from prescription drugs in 2008, reported Femalefirst.
"I think that she provides such a wonderful environment for Matilda to grow up in, especially in the sort of industry that she's in," Kate said.
Ledger's close friend Matt Amato, with whom he co-founded the music and film company The Masses, dubbed the "Manchester By The Sea" actress as an "incredible mother".
"The way she's been an incredible mother, she has hero status all across the board.
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