A former primary school principal has left about $1 million to her Indonesian maid of 13 years.

Madam Khoo Guat Neo, who was 92 when she passed away last year, bequeathed what is estimated to be a third of her estate to her maid.

They had lived in a landed property in Jalan Pelatina, off Upper Thomson Road. After Madam Khoo, who was single, died, the maid returned to Indonesia.

The Indonesian came back to Singapore last month to receive the money, reported Chinese daily Lianhe Zaobao.

About $760,000 of Madam Khoo's estate was also donated to Kwong Wai Shiu Hospital. Her neighbour, Mr Tan Kwee Lim, presented a cheque to the hospital during its 103rd anniversary celebrations on Saturday.

She also gave $100,000 and her 10 cats to the Cat Welfare Society, while $200,000 went to her hairdresser. The rest of the money went to her doctor and her nephew.

Madam Khoo's lawyer, Mr Raymond Lye, told The Straits Times that she had a medical certificate to prove that she was "mentally sound" during the making of the will.