Holding daughter Matilda, Michelle Williams arrived in Perth, Australia, Wednesday for Heath Ledger’s funeral.

Sources say it is her love for their 2-year-old daughter that is providing the strength as she mourns the late actor’s untimely death.

“Michelle was always really vulnerable, so this has shaken her quite a bit,” a friend of Williams tells Us Weekly in its latest issue, on newsstands now. “She’s mourning and trying to figure out what to do next.”

Matilda, though, “is too young” to know the heartbreaking reason why her father isn’t around anymore.

“Michelle and the family are showering Matilda with love right now to cushion it so she isn’t really aware,” a source close the family tells Us Weekly in the newest issue.

The source adds: “Michelle basically told Matilda, ‘Daddy went away.’ Matilda still doesn’t grasp it.”

Matilda, who was often seen around New York City on Ledger’s shoulders before his shocking January 22 death, “looks just like her father,” a friend close to Williams told Us.

Her mother agrees.

“All that I can cling to is his presence inside her that reveals itself every day,” Williams, 27, said in a statement Friday. “His family and I watch Matilda as she whispers to trees, hugs animals and takes steps two at a time, and we know that he is with us still.”

That is so sad.

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