I was just thinking about that . The hotel in chiang Mai, and then I think also Koh Samui ? The rooms and mattresses had been sprayed with toxic bug killer. Made headlines in the UK and Thailand. A few ladies died. As it was widely published, I think it frightened a lot of hoteliers and they stopped using these deadly chemicals. Hopefully for good. Terrible death.
Otherwise, ladies are generally safe in Thailand. I would advise only using hotel taxis , or don’t use alone. Also , not getting drunk or high , also avoiding lonely places like waterfalls . Thai men don’t usually bother with foreign girls, they feel overshadowed by them.
( this repeated to me from some Thai men friends ).