a mother was killed in a circular house riddle

A rich family lives in a round house, when the family came back form their dinner date their mother was dead.

The daughter said she was playing with her dolls, the son said he was playing outside in the garden, the maid said she was dusting corners, the butler said he was watching the son, and the chief said he was baking pies.

Who killed the mother?

Answer: Please provide your opinion below in comments section

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Maid,as she said she was dusting the corners and in a round house there are no corners