She was being monitored in an isolated ward in a hospital in Nakhon Pathom, 37 miles (60km) west of Bangkok.
In a message to the country, Public Health Minister Anutin Charnvirakul said: 'We can control the situation.
'There have not been cases of human-to-human transmission in Thailand because we detected the patients as soon as they arrived.'
Saying there are no reports of the infection spreading to others, he added: 'We checked all of them: taxi drivers, people who wheeled the wheelchairs for the patients, doctors and nurses who worked around them.'
Two other Chinese patients in Thailand have recovered and been sent home, while a third will return once tests show he is clear of the virus. One of the four patients was a Thai national.
Thai officials have stepped up screening at airports to look for passengers with high body temperatures, coughs, headaches and trouble breathing.
In a message to the country, Public Health Minister Anutin Charnvirakul said: 'We can control the situation." Oh Yeah 555!! "
