Albert Tan's surgery was successful thanks to Ann's blood donation. However, he was immediately transferred to the ICU after the surgery for further observation.
The Doctor needed to make sure that his body would not have any negative reactions from the blood transfusion.
Once he was in ICU, the General Surgeon who had operated on him strictly enforced that only immediate family were allowed to visit him during this time. Meaning, Sophia, Claudia, and Grandma Tan were the only ones allowed and no one else.
Although Ann knew that she was his biological daughter and the one who had saved him, it was still unknown to the others besides Sophia, the doctors, and the nurses who assisted during the operation that she was a member of the Tan family.
Therefore, she was now just the person who helped save someone's life and nothing else from an outsider's eye.
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