The daughter of a woman who was bashed to death with a hammer has made a plea to the public to find the killer.

Christine Erceg, 41, was found bound and bashed with a hammer in her Mount Nasura home, south-west of Perth, on Sunday afternoon and died later in hospital.

Police described the attack as brutal and sustained.

The woman's three children were not home at the time, nor was her flatmate, but a male acquaintance witnessed the bashing with a claw hammer.

Her 18-year-old daughter Tanika has asked anyone with information about the attacker to contact police.

"My brother, sister and I lost our mother yesterday because of some heartless people who murdered her," she said.

"We've all been asking ourselves what sort of people would do this. Did they know she had kids? What was going through their heads?

"What did she do to deserve all of this? Because no one deserves to go that way."