When the teenager at her door identified herself as a nursing student, Madam Melisse Lee Daimwood immediately felt a soft spot for her.
After all, she had had a good experience with nurses when she gave birth to her firstborn.
So when the teen claimed she was from a local polytechnic and asked for donations to help her school raise funds for a "charity", Madam Daimwood thought nothing of it.
She gave $10 and got a coin bank in return. But it turned out to be a scam.
On Thursday, in a posting on its Facebook page, Tan Tock Seng Hospital (TTSH) warned the public about a fund-raising scam.
It also said the girl was not a student of the polytechnic, but did not specify the polytechnic she was from.
The TTSH Facebook page states that the programme called "Singapore Young Hearts charity" is not registered under the hospital.
A Ministry of Culture, Community and Youth spokesman also said there is no such organisation.
Madam Daimwood, 32, a graphic designer, told The New Paper on Thursday that the teen had appeared at her Redhill flat on Oct 21, claiming she was raising funds for TTSH's "Singapore Young Hearts charity".
She said the "charity" was for children needing heart transplants.