This scam happened to a woman visiting the City of Manila in the Philippines. She is fine now but shared it so others may learn and avoid it. Others have reported something similar in other countries, even to a man in Japan. The getting-drugged part is extremely common but it typically happens to young travelers in bars, not a mid-day to mother, to an older woman.
The sad thing is that she enjoyed what she felt was an authentic experience with local women and she’d have been happy to pay for it — without being drugged and robbed.