This is the main point, "Surachet said the operation was carried out after the prime minister ordered police to crack down on illegal immigrants suspected to be in Thailand to carry out various scams, including romance scams and ATM skimming." There are a lot of people was skimmed their cards everyday, especially in tourist attractions area.
The minimum charge is 500 baht per day and the maximum is 20,000 baht if she overstayed for 40 or more days. She could contact the immigration, they will advise on the best way.