If a woman or girl does something by herself, she does it alone or without help from anyone else.

She lives by herself in an enormous house. 她独自一人住在一所巨大的房子里。

Holly's only three but she wrote her name all by herself. 霍丽只有3岁，但她完全能自己写自己的名字。

The child was playing by herself in the garden.

She raised four children all by herself.

Her parents started letting her walk to school by herself.