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Olsen, a friend of the late actor, believed she would be able to watch the film but left a weekend screening after only 20 minutes when she found it too distressing.
"It got to be too much for her," a source told Life & Style. "She wanted to go unnoticed, but people recognised her and started whispering. She felt really weird.
"Between dealing with Heath on screen and with everyone around her, she couldn't take it. So she left."
Olsen was rumoured to be dating the actor when he died from an overdose of prescription pills in January.
It later transpired that his masseuse had called her four times upon discovering Ledger's body in his New York apartment.
