Perhaps she was an illegitimate daughter.

也许她是个私生女。

youdao

She borrowed and spent wildly, eventually spinning a yarn that she was the illegitimate daughter of Andrew Carnegie, one of American's wealthiest men.

她借钱无数，生活挥霍无度，最终编织了一个谎言，声称自己是全美国最富裕的人安德鲁卡耐基的私生女。

youdao

Mr Toledo, for example, has been linked to a pyramid savings scandal, and is alleged to have abandoned an illegitimate daughter.

ECONOMIST: Peru

If so, it is plausible that he would have tried to have his father's mistress and her illegitimate daughter painted out of history.

ECONOMIST: Portrait of a lady and her daughter

They had an illegitimate daughter, then married and had two sons.

NPR: Einstein: Relatively Speaking, a Complicated Life