What year was this,
Pre 2010. On the road from Częstochowa to Warsaw. Very cheap even then.
I think those must've been either desperate drug addicts or victims of human trafficking:
I'd guess the former. Very sad. An acquaintance who is more familiar with such women says that some are Belar*SSian however most are local.
Only thanks to being clever she managed to escape this nightmare
In my town in the U.K. there was a scandal. Some women from Poland had answered adverts for care worker jobs. When they arrived, they were picked up from the coach, had their passports taken and then driven to different brothels. Some organised by the Polish couple who'd placed the adverts in the newspapers, others run by the r*SSian mafia. Most of them spoke no English.
Fortunately one of the women had enough English to tell a regular client at the brothel, a taxi driver, who went to the police. The couple who ran the adverts were jailed for a long long time and the r*SSians fled the country. All the women were found and returned home.